Prince William Competes in Charity Polo Match, Adorably Chases 3-Year-Old Cousin Mia Tindall: Pics!

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The Duke of Cambridge and his second cousin stole the show on Sunday!

Prince William spent his Sunday horsing around on and off the polo field.

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The Duke of Cambridge participated in the Maserati Royal Charity Polo Trophy at Beaufort Polo Club in Gloucestershire, England, where he was also spotted having some fun with his 3-year-old second cousin, Mia Grace Tindall.

The benefit match helped raise funds and awareness for two charities that William supports as Patron: Child Bereavement UK and Fields in Trust.

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During breaks from playing in the match, the 34-year-old royal was seen goofing off with the kids and chasing little Mia around the field. Mia, daughter of Zara and Mike Tindall, is Queen Elizabeth II's great-granddaughter and granddaughter of Princess Anne.

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The day before, Prince William was seen taking part in the Colonel's Review -- the rehearsal for Trooping the Colour -- which is the ceremonial event marking the official birthday of Queen Elizabeth II.

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