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LONDON, UNITED KINGDOM - JUNE 16: Queen Elizabeth Ll And Prince William Waving From The Balcony Of Buckingham Palace During Trooping The Colour, The Queen's Official Birthday. (l To R) Countess Patricia Mountbatten, Prince Edward, Duchess Of York, Queen Mother, Princess Margaret, Queen, Prince Philip, Prince William, The Grand Duchess Josephine Charlotte Of Luxembourg, Prince Harry, Prince Charles, Lord Frederick Windsor, Princess Diana, Lady Rose Windsor, Lady Gabriella Windsor And The Duchess Of Kent. (Photo by Tim Graham/Getty Images)

LONDON, UNITED KINGDOM - JUNE 16:  Queen Elizabeth Ll And Prince William Waving From The Balcony Of Buckingham Palace During Trooping The Colour, The Queen's Official Birthday.  (l To R) Countess Patricia Mountbatten, Prince Edward, Duchess Of York, Queen Mother, Princess Margaret, Queen, Prince Philip, Prince William, The Grand Duchess Josephine Charlotte Of Luxembourg, Prince Harry, Prince Charles, Lord Frederick Windsor, Princess Diana, Lady Rose Windsor, Lady Gabriella Windsor And The Duchess Of Kent.  (Photo by Tim Graham/Getty Images)