LONDON - JUNE 14:   Queen Elizabeth II (C) laughs with Prince William (L) who joins her along with Prince Harry (2nd L) and Prince Philip, Duke of Edinburgh (R) on the balcony of Buckingham Palace for Trooping The Colour celebrations on June 14, 2008 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle.  (Photo by Tim Graham/Getty Images)