Britain's Queen Elizabeth and Prince Philip sit in a horse drawn carriage as they make their way from Buckingham Palace to attend the Trooping the Colour ceremony in central London June 11, 2011. Trooping the Colour is a ceremony to honour the sovereign's official birthday. [Photo/Agencies]
Britain's Prince William (2nd horse L), Prince Charles, the Duke of Kent and Princess Anne ride horses as they make their way from Buckingham Palace to attend the Trooping the Colour ceremony in central London June 11, 2011. [Photo/Agencies]