Image 1 of 1
Camilla, Duchess of Cornwall (L) and Catherine, Duchess of Cambridge ride in a carriage for the Trooping the Colour ceremony on 15 June, 2013  in London, Britain The annual ceremony, made up of more than 600 guardsmen and cavalry, is believed to have first been performed during the reign of King Charles II. The parade marked the official birthday of the Sovereign, even though the Queen's actual birthday is on April 21st. (Photoshot/iPhoto)