LONDON, ENGLAND - MAY 12: Prince Philip, Duke of Edinburgh and Queen Elizabeth II arrive for the Queen's garden party at Buckingham Palace on May 12, 2015 in London, Britain. (Photo by Stefan Wermuth - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 12: Prince Philip, Duke of Edinburgh and Queen Elizabeth II arrive for the Queen's garden party at Buckingham Palace on May 12, 2015 in London, Britain. (Photo by Stefan Wermuth - WPA Pool/Getty Images)