The Queen & Duke Of Edinburgh Carry Out Engagements In Windsor [Getty Images]

WINDSOR, ENGLAND - APRIL 21: Queen Elizabeth II and Prince Philip, Duke of Edinburgh wave from the top of an open Range Rover on the monarch's 90th Birthday on April 21, 2016 in Windsor, England. Today is Queen Elizabeth II's 90th Birthday. The Queen and Duke of Edinburgh will be carrying out engagements in Windsor. (Photo by Chris Jackson/Getty Images)

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