WINDSOR, ENGLAND - APRIL 16: Queen Elizabeth II attends the Easter Day service at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

WINDSOR, ENGLAND - APRIL 16:  Queen Elizabeth II attends the Easter Day service at St George's Chapel on April 16, 2017 in Windsor, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)

WINDSOR, UNITED KINGDOM - APRIL 16: Girls curtsey as Queen Elizabeth II and Prince Philip, Duke of Edinburgh leave the Easter Day service at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Peter Nicholls/WPA Pool/Getty Images)

WINDSOR, UNITED KINGDOM - APRIL 16:  Girls curtsey as Queen Elizabeth II and Prince Philip, Duke of Edinburgh leave the Easter Day service at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Peter Nicholls/WPA Pool/Getty Images)

WINDSOR, ENGLAND - APRIL 16: Autumn Phillips (2L) Peter Phillips (L) Catherine, Duchess of Cambridge (R) Prince William, Duke of Cambridge, Princess Beatrice of York (3R) and Princess Eugenie of York (3L) attend Easter Day Service at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Samir Hussein/Samir Hussein/WireImage)

WINDSOR, ENGLAND - APRIL 16:  Autumn Phillips (2L) Peter Phillips (L) Catherine, Duchess of Cambridge (R) Prince William, Duke of Cambridge, Princess Beatrice of York (3R) and Princess Eugenie of York (3L) attend Easter Day Service at St George's Chapel on April 16, 2017 in Windsor, England.  (Photo by Samir Hussein/Samir Hussein/WireImage)

WINDSOR, ENGLAND - APRIL 16: Catherine, Duchess of Cambridge performs a curtsy to Queen Elizabeth II as she attends Easter Day Service with Prince William, Duke of Cambridge and Princess Beatrice of York at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Samir Hussein/Samir Hussein/WireImage)

WINDSOR, ENGLAND - APRIL 16:  Catherine, Duchess of Cambridge performs a curtsy to Queen Elizabeth II as she attends Easter Day Service with Prince William, Duke of Cambridge and Princess Beatrice of York at St George's Chapel on April 16, 2017 in Windsor, England.  (Photo by Samir Hussein/Samir Hussein/WireImage)

WINDSOR, ENGLAND - APRIL 16: Catherine, Duchess of Cambridge (R) Prince William, Duke of Cambridge, Princess Beatrice of York (2L) and Princess Eugenie of York (L) attend Easter Day Service at St George's Chapel on April 16, 2017 in Windsor, England. (Photo by Samir Hussein/Samir Hussein/WireImage)

WINDSOR, ENGLAND - APRIL 16:  Catherine, Duchess of Cambridge (R) Prince William, Duke of Cambridge, Princess Beatrice of York (2L) and Princess Eugenie of York (L) attend Easter Day Service at St George's Chapel on April 16, 2017 in Windsor, England.  (Photo by Samir Hussein/Samir Hussein/WireImage)