TETBURY, ENGLAND - JUNE 18: Zara Phillips and Mia Tindall with Prince Harry during the Maserati Royal Charity Polo Trophy at Beaufort Polo Club on June 18, 2016 in Tetbury, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

TETBURY, ENGLAND - JUNE 18:  Zara Phillips and Mia Tindall with Prince Harry during the Maserati Royal Charity Polo Trophy at Beaufort Polo Club on June 18, 2016 in Tetbury, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)