The Prettiest Dresses We've Ever Seen Walk the Red Carpet at Cannes

Sienna Miller finished off her red carpet takeover at Cannes in a lacy blue-gray full skirt, leather spaghetti-strap tank, and dusty rose belt.

The model walked the red carpet at the Cannes closing ceremony in a structured strapless yellow gown with eye-catching fringe detail and a front slit.

The actress saved her darkest look for last. She completed her black gothic-inspired turtleneck dress with nothing but a simple diamond ring.

The actress sparkled in a Spring 2015 Dior Couture mini embellished with sequin florets. She completed her look with metallic pumps and Chopard diamond earrings.

The actress looked effortlessly romantic at the Macbeth premiere in a tiered, pleated-sleeved dusty pink Gucci gown, red Bulgari jewels, and a turquoise clutch.

The actress added an unexpected twist to her watermelon-hued satin jumpsuit: a pair of pink metallic mules.

Marion dazzled at the Little Prince premiere in a cutout gown and a bracelet she designed with Chopard.

The model looked like a goddess in a shimmering cutout KaufmanFranco gown, Chopard jewels, and a Rauwolf clutch as she walked the red carpet for The Little Prince.

Jourdan knew just how to pose in her sheer black lace Ralph & Russo couture gown, which she completed with Chopard jewels.

Liu Wen showed off an ice blue Ralph & Russo couture column gown.

Kendall Jenner chose a sexy crop-top set by Azzedine Alaïa, completing her look with a Chopard diamond choker and matching bracelet and complementing stud earrings. Much to our surprise, Joan Smalls wore a similar look from the same Spring 2015 collection!

The supermodel made an edgy statement in a zipper-adorned Louis Vuitton dress that boasted not one but two leg slits.

The newlyweds brought their style sense to Cannes, mastering the navy and black color combination on the red carpet.

The model balanced Kendall Jenner's all-black Azzedine Alaïa look with a creation from the same Spring 2015 collection. Smalls wore her crop top and slit skirt with an envelope clutch, neutral sandals, and sparkling pink-accented diamond earrings.

The actress proved she's not afraid of making a statement in an avant-garde design. Her black strapless long-sleeved dress boasted a curved neckline and a hot-pink wraparound ribbon that ballooned into an oversize bow at the back. She completed her look with a dazzling Cartier necklace.

The actress pulled off an elegant teal long-sleeved Prada design with a simple satin clutch.

The supermodel showed a sexy slit of leg and side boob in a strappy black Mugler design and silver Lynn Ban jewelry.

The model didn't hesitate to pair her satin gown with gorgeous diamond and emerald drop earrings, making a colorful statement on the carpet.

Petra Nemcova's embellished peplum jacket met a flowing chiffon skirt that billowed all around her as it caught the wind, making for a flawless style moment, courtesy of designer Zuhair Murad.

Sara Sampaio proved that royal blue is her color in a crisscross column dress.

A slinky golden Versace dress, complete with sheer lacy detail on the sides, was played up by metallic pumps.

The young model looked elegant in a structured navy satin dress.

Barbara Palvin stunned in a sheer Versace cutout design that came complete with a dramatic train.

Anja Rubik worked a supersexy formfitting Versace dress with glittering net detail.

Kristina Bazan brought pastel color to the carpet in her glittering colorblock dress and jewel-embellished sandals.

Who says black and white has to be boring? Izabel Goulart jazzed up her paneled strapless design with stunning diamond earrings.

The model attended the store opening of De Grisogono in France wearing a silk slip dress and circular diamonds.

Fonda worked an off-white suit and a fringe statement necklace that made our jaws drop.

The actress looked lovely in a floral minidress and white pumps at the Youth photocall.

Kendall's daytime look was just as lovely as her red carpet ensemble. She paired a white eyelet crop top with a tailored heather-gray skirt, strappy metallic pumps, and printed sunglasses.

The model stepped out in a pastel purple tailored suit.

The model looked lovely in a turquoise strapless Oscar de la Renta gown finished with floral appliqués. She slipped on diamond De Grisogono jewels to play up the sparkle.

The model and actress worked a cream asymmetrical dress that draped elegantly above silver sandals. She completed her ensemble with a gorgeous De Grisogono choker necklace and rings made of emeralds and diamonds.

Izabel Goulart looked supersexy in a pre-Fall 2015 Zuhair Murad sheer dress that was covered in shimmering black florets. She played up the design with intricate diamond earrings.

The model certainly brought the edge in a shiny black pleated Givenchy Haute Couture dress complete with a wide-plunging neckline. But the most striking part of her look had to be those sparkling pink hoop earrings!

The model showed off her body in a halter-neck sheer gown that was adorned with cutouts and sequins.

The supermodel made a sexy statement and showed off cleavage in a white strappy gown.

Michelle Rodriguez opted for a cream high-neck gown with a simple train at the De Grisogono party.

We love how Natasha Poly added structured to her elegant white one-shouldered dress with a black tuxedo blazer.

Eva Longoria's satin halter-neck dress flattered her figure and upped the sexy factor with a cutout and high slit that exposed platform heels.

The singer opted for a structured black mermaid gown with a contrasting print interior and embellishment at the hip.

Paris made a statement in a sparkling black naked dress, silver pumps, and diamond drop earrings.

The athlete brought the shimmer to the carpet in a sparkling navy gown.

The actress dazzled in a Stella McCartney crystal-studded dress with a cutout back. She finished her look with emerald statement jewels.

The star stunned in one of our favorite Cannes dresses yet: an emerald-green Fall 2015 Lanvin number that was totally elegant yet effortless.

The supermodel chose a black-and-white strapless gown by Dior, playing up her look with edgy silver jewels, including a bar ear cuff.

Leave it to Cate to sparkle in all black. The actress wore a three-quarter-sleeve embellished Spring 2015 Armani Privé design that was cinched with a thick belt.

Adriana Lima completed her tight strapless black dress with stunning Chopard jewels, including a pair of emerald Copa Cabana earrings, and Stuart Weitzman heels.

The actress kept it sleek and sophisticated in an olive Louis Vuitton Resort 2016 dress.

Kristina Bazan made a statement in a yellow flowing number. Her white embellished strappy sandals peeked out from her leg slit.

Emily Blunt attended the photocall for Sicario in a Fall 2015 Peter Pilotto design that definitely didn't lack color. She played up her striking geometric-print dress with complementing yellow-green sandals.

The actress looked sultry in a silk midlength dress with cutouts and metallic pumps at the Calvin Klein party.

The actress looked sleek and sexy in a neutral strapless column gown.

Harley Viera-Newton brought on the glow in a light-yellow silk dress at the Calvin Klein party.

Rachel Weisz chose a striking red halter-neck design that was eye-catching yet movable when paired with a pair of simple strappy heels.

The model looked like a bohemian goddess in a white spaghetti-strap gown and easy slip-on sandals.

The ladies showed off tailored Calvin Klein separates, from pale-yellow culottes to a powder-blue leather dress and a wide-leg, structured jumpsuit.

The supermodel rocked a navy-blue statement suit at the Calvin Klein party.

It was a statement in all white for Chiara, who showed a hint of side boob in her Calvin Klein sheath dress. She brought the edge with a chain-adorned clutch and chunky T-strap platforms.

Kat Graham kept it simple by choosing a navy knee-length dress with an athletic-cut neckline. She finished her look with touches of metal, from a skinny belt to a choker and matching clutch.

Hailey partied in a gorgeous Gabriela Cadena mermaid gown and a striking choker necklace to match.

The actress attended the Chopard party in a glittering body-hugging sheer gown that featured a floral design.

The model chose a Zuhair Murad design from the Spring 2015 Couture collection: an elegant long-sleeve dress with a flowing bronze train that she spun like a cape on the carpet.

The model looked lovely in a neutral three-quarter-sleeve gown, covered in jewels and complete with a thin belt.

Josephine Skriver showed off a satin slip dress that was finished with side cutouts and a printed halter neck.

The star chose an elegant satin Prada dress that draped off the shoulders. She completed her outfit with a diamond cuff, long drop earrings, strappy black heels, and a box clutch.

The supermodel stunned in a sexy slitted dress, diamond jewels, and metallic Giuseppe Zanotti sandal heels.

The model looked lovely in an off-white jumpsuit and a double-wrap diamond necklace.

Toni Garrn looked like a bronzed goddess in a satin long-sleeved dress, Giuseppe Zanotti heels, and diamond drop earrings at the Chopard party.

The actress hit up the party scene in a star-spangled, long-sleeved minidress that boasted sheer detail.

Poppy showed off her gorgeous floral appliqué Chanel dress, playing up the blues in her design with a sapphire Chopard statement necklace.

The supermodel rocked trouser pants, pointed-toe heels, and a lace-up high-neck top to the Calvin Klein party.

Nina Agdal showed off her booty in a formfitting red crochet dress and white standout Stuart Weitzman heels.

Jessica Lowndes took a risk in a wrap-dress silhouette that was finished with a deep-plunging neckline.

The model tied back her hair and let her glittering long-sleeved gown take center stage.

Amy Poehler looked effortless working her LBD with an envelope clutch and chic platform sandals.

Eva Longoria turned heads in an asymmetrical black design that got even more sex appeal from tall strappy heels.

The actress chose a neutral gown that was complete with pleating and a ruffle that wrapped along the neckline.

Mindy Kaling chose a color scheme that played to her signature style at the premiere of Inside Out. She and her stylist, Salvador Perez, collaborated on the design, which was complete with a shimmering crystal trim and a sexy leg slit. The actress played up the glitz with L'Dezen diamonds and sparkly sandals.

The actress chose a sleek black column dress, cinched at the waist with a plated gold belt, and finished her look with sky-high pumps and diamond earrings.

Lily Donaldson hit the carpet in a mystical silver gown with hoop earrings.

The model struck a pose in a sexy black cutout dress, diamond drop earrings, and a chain-link bracelet.

The star showed off her fierce gray body-hugging dress, complete with lacy sheer panels, and completed her look with Lorraine Schwartz jewels.

The supermodel channeled her inner goddess and showed off a light turquoise ethereal gown, complete with a layer of printed chiffon.

We loved Andie MacDowell's fire-red Elie Saab look: a shimmering dress with a plunging neckline and a skinny belt that added a bit of flair to her ensemble.

Paris Hilton brought the shimmer to the red carpet in a gold body-hugging Yousef Al-jasmi gown, and she piled on plenty of complementing accessories: chunky bracelets, a ring, and a choker necklace.

The always-stylish star chose a flouncy floral Alexander McQueen dress, Saint Laurent pumps, and Lˊ Dezen jewels for a photocall.

Amy Poehler went for a bold move in a long-sleeved cobalt dress. We'd like to think she was channeling Mad Men in the '70s-inspired silhouette, which she played up with turquoise patent pumps and a matching ring.

Mindy Kaling colorblocked in a Roksanda Ilincic midi dress, playing up the structure with geometric Tamara Mellon heels and completing her look with Kimberly McDonald statement rings.

Amy Poehler paired her printed long-sleeved minidress with ankle-strap heels and a sash at the waist.

House of Cards star Rachel Brosnahan promoted her film Louder Than Bombs at Cannes in a tailored suit and power heels.

Paris showed off her all-white monochrome lacy ensemble at a party in Cannes. She balanced her feminine pieces with edgy stud embellishments.

The actress walked the red carpet at the premiere of Carol in an avant-garde strapless Giles design with an eye-catching print and tied with a multilayered bow at the back.

The actress continued to wow in white, choosing a ruffled halter-neck Rochas dress that was finished with a flower and shimmering embroidery.

Sienna Miller stood by director Xavier Dolan's side in a dramatic star-covered Sonia Rykiel dress that came complete with a cape. She finished off her sheer statement look with Bulgari jewels.

Eva Longoria's satin navy Atelier Versace gown was played up by sapphire Lorraine Schwartz jewels.

Salma Hayek looked flawless in a purple structured Gucci gown, which came complete with a plunging neckline.

Poppy Delevingne completed her Burberry mirror dress with a gorgeous Chopard diamond necklace.

Toni Garrn wore a satin navy and bronze Sophie Theallet dress that draped gorgeously at the neckline. She completed her outfit with a diamond choker.

Model Lindsay Ellingson chose a lightning-effect silver strapless gown with diamond drop earrings.

Erin O'Connor matched the red carpet in her strapless bow-adorned Ralph & Russo Couture gown and complementing strappy heels.

The actress arrived at the Carol afterparty wearing a dusty-pink Alexander McQueen gown and diamond stud earrings.

Rooney Mara kept things feminine yet sleek in a black-and-white ruffled set and ankle-strap heels.

Natalie Portman completed a Fall 2015 Rodarte dress with black embellished ankle-strap sandals.

Cate Blanchett let her black bra shine through the sheer bodice of her tiered high-neck Alexander McQueen dress and covered her shoulders with a cutout leather jacket.

The actress made her Cannes debut in a lacy paneled Alexander McQueen dress and neutral ankle-strap sandals, proving she knows how to master an all-white monochrome look.

Diane Kruger looked lovely in a black lacy Oscar de la Renta sheer halter dress. She added a pop of color with emerald Lorraine Schwartz jewels.

The star stunned when she swept her hair up and let her black shimmering evening dress, complete with a bow at the waist, take center stage. She finished her ensemble with diamond earrings that played up the sparkle on her dress.

Jane Fonda made our jaws drop when she rocked a second bodycon gown at Cannes. This time she opted for a full-length sparkly design that she completed with a diamond necklace, a complementing clutch, and embellished flats.

The actress stepped out in a kelly green asymmetrical Michael Kors dress with a ruffle at the hem.

Diane Kruger sported a Fall 2015 Valentino solar system mini dress and played up the color with orange pointed-toe pumps.

Each of the sisters played to her own signature style. Alana chose snakeskin shorts, mid-rise booties, and a founcy boho-inspired top, while Danielle and Este showed off easy, flowing separates in darker hues.

Eva Longoria showed of her whites in a bodycon dress and matching ankle-strap sandals.

The actress showed off her toned figure in a white strappy crop top and black high-waisted skirt.

Camila Alves showed off the BCBG Max Azria for Magnum Belgian chocolate wrap, which was infused with the scent of chocolate. She layered it over a white crochet dress, blazer, and neutral pumps.

Salma Hayek's layered red minidress was played up by neutral two-toned sandals.

Sienna Miller's blue, red, and yellow Valentino kite dress looked absolutely gorgeous on the actress, who swept back her hair to show off the strappy detail on the back of her gown and her Atelier Swarovski jewels.

Diane Kruger showed off her own version of the naked dress: a Prada sequin-embellished halter number with side panels and a long train that draped all around her. She completed her look with a blue satin clutch and diamond jewels.

Camila Alves showed off a gorgeous black gown with a full tulle skirt, long train, and lace bodice. She played up her plunging neckline with an eye-catching diamond statement necklace by Lorraine Schwartz.

Naomi Watts and Matthew McConaughey made an entrance arm in arm, Naomi in a one-shoulder, floral-embroidered tiered design by Armani and Matthew in a Dolce & Gabbana satin oxblood jacket and bow tie. Naomi completed her ensemble with Bulgari jewels.

Jane Fonda showed off her amazing body in a cobalt Atelier Versace gown complete with sheer cutout details and a train. She completed her gorgeous dress with diamond drop earrings.

Natasha Poly was a vision in a gold full-sleeved custom Michael Kors dress that she completed with matching sandals and a silver wraparound snake choker.

Li Bingbing wore an ethereal powder blue Zuhair Murad design complete with textured detail, a shimmering gold belt, and a full skirt that wrapped around the column of her dress. She played up the sparkle with matching Cindy Chao statement earrings and a ring, and a small box clutch.

Andie MacDowell wore a white floral, beaded, and embellished dress to the premiere of The Sea of Trees. She finished her look with drop earrings and a translucent box clutch.

Emma channeled a '90s bride on the red carpet at the Irrational Man premiere, opting for a white textured high-neck gown by Christian Dior, complete with an open back and the daintiest of straps. She played up her elegant design with a shimmering choker necklace.

Michelle stuck to her all-black streak in a gorgeous sheer-panel gown with lace cap sleeves. She added standout diamond jewelry.

Rachel Weisz chose a glittering white Louis Vuitton gown for the premiere of The Lobster. She let her crystal embellishments shine, accessorizing with nothing but black sandals.

Léa Seydoux stood by Rachel Weisz's side in a lovely periwinkle Miu Miu dress, with her crystal trim and drop earrings complementing Rachel's shimmering sleeves.

The actors coordinated prints at the Sea of Trees premiere, Naomi choosing an embroidered Peter Pilotto design and McConaughey dressing in Dolce & Gabbana and accessorizing with a sleek patterned scarf.

Natalie Portman looked lovely in a strapless, black-and-powder-blue printed Christian Dior Couture dress. The Spring 2015 design was played up by Natalie's diamond stud earrings and black pumps.

The actress made her Cannes debut at the photocall for Disorder in a powder blue Dolce & Gabbana dress embellished with a sequin rose and crystal buttons, which adorned the sleeves and back of the design. She let the Fall 2015 mini shine by completing her look with neutral ankle-strap sandals.

Salma Hayek dressed up a tailored button-front LBD with simple sandals and an oversize clutch.

Eva Longoria looked effortless in a flowing asymmetrical sheath dress. When it came to accessories, she stuck with neutral tones and added taupe sandals and brown colorblock, oversize sunglasses.

Naomi Watts chose to let her stunning Bulgari jewels shine, opting for a sleek A-line LBD.

Adèle Exarchopoulos wore a sexy slitted Louis Vuitton number, complete with a zipper, for the premiere of Irrational Man.

Emma Stone made her Cannes 2015 debut at the photocall for Irrational Man. The star showed up in a feminine, flouncy Oscar de la Renta number, complete with a full tulle skirt and a sheer layer of lace. Emma brought edge to her dainty dress with four hoop ear cuffs.

The actress looked bold in a Narciso Rodriguez Fall 2015 cutout jumpsuit, which she completed with royal blue tassel drop earrings and open-toe sandals.

Léa Seydoux made a strong statement in an embellished Prada dress. She balanced the design's structure with pretty pink two-toned heels.

The actress swept the red carpet in a gilded, strapless Alexander McQueen design, playing up the shimmer with an eye-catching snake arm cuff.

Naomi Watts made a chiffon polka-dot maxi dress more casual with the addition of a luxe leather moto jacket and sandals.

While Julianne Moore and Salma Hayek chose feminine black dresses — Julianne's adorned with a satin black bow and Salma's in an off-the-shoulder silhouette — Zoë made a striking statement in a loose colorblock number.

Sienna knows how to choose an LBD that makes a statement! The star chose this pre-Fall 2015 number, complete with a plunging neckline cutout detail and adorned with a bow. She stood tall in her sandals and completed the look with Atelier Swarovski jewels.

Michelle Rodriguez was all business at the Swarovski party, sporting sleek black separates, including a crisp buttoned blazer. She played up her look with strappy pumps and a gorgeous diamond chain choker.

Lupita's pleated white Oscar de la Renta look got a touch of edge with the addition of a studded belt and complementing printed heels.

Julianne Moore's perfect Fall 2014 Chanel Couture day dress came complete with a shimmering trim, which the actress played up with a striking ring. She contrasted her silver look with black accessories.

Salma looked sleek in an oxblood leather dress and black patent pumps.

Charlize Theron shone bright at the Mad Max: Fury Road premiere in a yellow structured Dior Couture strapless gown that was finished with a long chiffon train. Her diamond jewels were big on the sparkle.

Zoë Kravitz joined Charlize Theron's side in a white crisscross Valentino gown complete with side cutouts. She added shimmer with a gold clutch and delicate jewels.

The actress took the red carpet at the premiere of Mad Max: Fury Road in a floral appliqué Marchesa gown we went to bed dreaming about. If you thought the bouquets on her dress were pretty enough, just look at her lavender flower crown and sparkling colorful jewelry.

Julianne Moore's custom one-shoulder Givenchy Haute Couture velvet dress had an alligator-skin bodice and revealed complementing ankle-strap pumps through its slit as she walked. She finished her gorgeous number with silver jewels.

Naomi Watts looked elegant in a black strapless lace design by Ralph Lauren that was wrapped with tulle. She completed her romantic dress with statement jewels from Bulgari: emerald-embellished drop earrings and a matching choker necklace.

Michelle Rodriguez stunned in a slick black Zuhair Murad floral-print design and an oversize ring.

Liya Kebede attended the Mad Max: Fury Road premiere wearing an eye-catching Proenza Schouler ensemble composed of a sheer midi skirt embellished with grommets, a fiery textured overlay, black ankle-strap sandals, and a metal box clutch.

Miranda Kerr showed off her supermodel bod in a flowing pink Emanuel Ungaro dress that got a sexy touch from a revealing neckline and a thigh slit.

Eva Longoria's sparkling silver three-quarter-sleeved dress featured a deep plunging neckline and a mermaid silhouette.

Sienna Miller accessorized her gray-and-black off-the-shoulder Fall '15 Balenciaga dress with ankle-strap pumps.

Lupita Nyong'o accessorized her Gucci dress with Chopard rings.

Sienna Miller's second Cannes look was a black-and-navy-blue custom Lanvin one-shoulder gown, complete with a bow. She accessorized with black sandals, diamond Atelier Swarovski earrings, and a chunky ring.

Julianne Moore made a strong case for feathers and sequins — just like Naomi Watts! The star played up the green embellishments of her Armani Privé dress with Chopard emerald hoop earrings.

Natalie Portman worked a sleek, strapless red column dress by Dior Couture with a pair of black pumps, diamond drop earrings, and a complementing bracelet and rings.

Naomi Watts completed her Fall 2015 Altuzarra dress with Bulgari jewels and metallic sandals at the Opening Ceremony dinner.

Karlie Kloss nixed her Versace number for a strapless, formfitting, embellished dress at the Opening Ceremony dinner.

Supermodel Doutzen Kroes slipped on a fierce black Mugler LBD complete with metal eyelet detail and finished her look with simple rings and sleek black pumps.

Miranda Kerr worked an embellished David Koma tube top and skirt set, along with mesh Christian Louboutin pointed-toe T-strap heels and a single black ring.

The actress made a statement in a Fall 2015 Valentino look, tying a scarf around her neck to complement the sheer detail of her fringe-finished dress. She kept it simple with tall ankle-strap sandals and Vita Fede jewels.

The actress attended a photocall in a body-con rose-print dress and black platform pumps.

Bar Refaeli's white Roland Mouret gown gathered at the sides and looked totally effortless when paired with statement earrings and a simple box clutch.

Doutzen Kroes took the Cannes red carpet in a formfitting Spring 2015 Atelier Versace gown. From the one-shoulder silhouette to the cutout and leg slit, this design definitely showed off the supermodel's best assets.