Princess Beatrice is no stranger to formal occasions, and over the years she's treated us to some very memorable looks, especially when it comes to hats and fascinators. The Philip Treacy creation she wore to Prince William and Kate Middleton's 2011 wedding became an instant talking point, and eventually sold in a charity auction for over $100,000. For Prince Harry's wedding to Meghan Markle, Bea opted for a slightly more subtle headpiece, choosing a teal Stephen Jones design that sat close to the crown, hugging her auburn hair. This time around, all the detail was in her dress, a ballet-length custom design by Roksanda Ilincic with sheer sleeves and hundreds of beads decorating its full skirt. She made a serious statement as she arrived at St George's Chapel in Windsor with her father Prince Andrew and sister Princess Eugenie. Take a look for yourself ahead.