LONDON, ENGLAND - MAY 10: Queen Elizabeth II speaks to Prime Minister David Cameron during a reception in Buckingham Palace to mark the Queen's 90th birthday on May 10, 2016 in London, England. (Photo by Paul Hackett - WPA Pool / Getty Images)
LONDON, ENGLAND - MAY 10: Queen Elizabeth II speaks to Prime Minister David Cameron during a reception in Buckingham Palace to mark the Queen's 90th birthday on May 10, 2016 in London, England. (Photo by Paul Hackett - WPA Pool / Getty Images)