See Prince William and Kate Middleton as Kids!

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Princess Diana and Prince Charles posed with an infant Prince William at Kensington Palace in London in February 1983.

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Three-year-old Kate climbed a hill at the Lake District in Northwest England.

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Princess Diana carried baby Prince William at the Aberdeen, Scotland, airport in October 1983.

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Prince William was in Westminster Abbey for the wedding of Prince Andrew and Sarah Ferguson in July 1986.

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Prince William had a new play partner at the Cirencester polo field in June 1987.

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At five years old, Kate smiled on a Summer afternoon in the UK.

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Prince William went go-karting in July 1988 in London.

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Prince Charles and Prince William boarded the Queen's Flight plane at Aberdeen Airport in Scotland in September 1984.

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Princess Diana arrived with matching sons Prince William and Prince Harry at Aberdeen Airport in August 1986.

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During a tour with Prince William, Princess Diana and Prince Charles posed at a photocall in Auckland, New Zealand, in August 1984.

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In September 1989, Princess Diana took Prince William and Prince Harry to Wetherby School in London. It was Prince Harry's first day.

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Four-year-old Kate, her father Michael, and younger sister Pippa posed on a family vacation in Jerash, Jordan.

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Prince William surveyed the Windsor polo ground in July 1986 in England.

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Prince Charles played with Prince William and Prince Harry at Kensington Palace in October 1985.

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Prince Charles and Princess Diana had a portrait session with a young Prince William at Kensington Palace in December 1983.

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Princess Diana and Prince Charles brought Prince William and Prince Harry along on vacation to Majorca, Spain, in August 1987 to visit with the Spanish royal family.

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Prince William posed with mom Princess Diana, dad Prince Charles, and other members of the royal family at his christening on Aug. 4, 1982.

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Kate Middleton, center front, was adorable as a young field hockey player in Pangbourne, England.

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Prince William waved on his first day at Wetherby School in January 1987 in London.

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Prince Charles and Princess Diana posed with a young Prince William as they arrived at Alice Springs Airport in Australia in March 1983.

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Prince William and Prince Harry played with their cousin Peter Phillips on a fire engine at Sandringham House in January 1988.

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Prince William played with the hound dogs at the Badminton Horse Trials in England in May 1991.

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Prince Harry arrived to attend his first day at nursery school with Charles, Prince of Wales; Diana, Princess of Wales; and his brother, Prince William, on Sept. 16, 1987, in London.

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Prince William and Prince Harry went with their parents to a wedding in Bath in May 1989.

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Prince William and Prince Harry played on their rocking horses at Kensington Palace together in October 1985.

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Prince William hitched a ride in a carriage with Princess Diana for the Trooping the Colour ceremony in June 1988 in London.

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Kate smiled after graduating from St. Andrews University in Scotland.

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Prince William and Prince Harry sat atop a police motorbike in November 1987 in Windsor, England.

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Princess Diana left London's St. Mary's Hospital with Prince Charles and their just-born son Prince William.

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Prince William showed skill with the press as a toddler at Kensington Palace in June 1984.

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Prince Charles and Princess Diana played with Prince William and Prince Harry in the wildflower meadow at their Highgrove Estate in July 1986.

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Prince William and Prince Harry watched the ceremonies of the Trooping the Colour at Buckingham Palace in June 1985 with their extended family, as well as mom Princess Diana and dad Prince Charles.

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Princess Diana and Prince William rode with the queen mother during the June 1987 Trooping the Colour ceremony.

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Prince William arrived for his first day at nursery school in London in September 1985.

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Prince William and Prince Harry played in uniforms in the garden of Highgrove House in Gloucestershire, England, during July 1986 with their mom, Princess Diana.

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Kate and William matched in white shirts after their university graduation in 2003.

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