Britain's Queen Elizabeth (4th L), Prince Philip (3rd R), Prince Willam (L), Prince Charles (R), Camilla, Duchess of Cornwall (2nd R) and other members of the royal family watch a fly-past from the balcony of Buckingham Palace after attending the Trooping the Colour ceremony in London June 12, 2010. The Trooping the Colour ceremony honours the sovereign's official birthday. Britain's Queen Elizabeth II celebrated her official birthday on Saturday in traditional manner on Saturday, by reviewing troops from her Guards regiments and viewing a flypast of Royal Air Force planes in central London. [Xinhua/Reuters]