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WINDSOR, ENGLAND - APRIL 21: Queen Elizabeth II receives a birthday cake from Nadiya Hussain, winner of the Great British Bake Off, during her 90th Birthday Walkabout 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 John Stillwell - WPA Pool/Getty Images)

WINDSOR, ENGLAND - APRIL 21:  Queen Elizabeth II receives a birthday cake from Nadiya Hussain, winner of the Great British Bake Off, during her 90th Birthday Walkabout 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 John Stillwell - WPA Pool/Getty Images)