The Duchess of Cambridge looks on as she attends the Queen's Birthday Parade, "Trooping the Colour", at the Horse Guards Parade, in London, on June 11, 2011. The ceremony, made up of more than 600 guardsmen and cavalry, is believed to have first been performed during the reign of King Charles II and in 1748 it was decided that the parade would be used to mark the official birthday of the Sovereign, even though the Queen's actual birthday is on April 21st. AFP PHOTO/CARL COURT (Photo credit should read CARL COURT/AFP/Getty Images)
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