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WINDSOR, ENGLAND - APRIL 22: Queen Elizabeth II talks with the Australian High Commissioner Alexander Downer (R) as she prepares to present the Prince Philip, Duke of Edinburgh with the Insignia of a Knight of the Order of Australia, in the white drawing room at Windsor Castle on April 22, 2015 in Windsor, England. (Photo by John Stillwell - WPA Pool/Getty Images)

WINDSOR, ENGLAND - APRIL 22:  Queen Elizabeth II talks with the Australian High Commissioner Alexander Downer (R) as she prepares to present the Prince Philip, Duke of Edinburgh with the Insignia of a Knight of the Order of Australia, in the white drawing room at Windsor Castle on April 22, 2015 in Windsor, England. (Photo by John Stillwell - WPA Pool/Getty Images)