LONDON, ENGLAND - JUNE 13:  (L-R) Princess Anne, Princess Royal, Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Prince George of Cambridge,Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Queen Elizabeth II, James, Viscount Severn, Prince Harry, Prince Philip, Duke of Edinburgh and Prince Andrew, Duke of York look out on the balcony of Buckingham Palace during the Trooping the Colour on June 13, 2015 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 Chris Jackson/Getty Images)