Check out this video of William, Harry and Kate at the The Audi Polo Challenge over the weekend.
The young princes played in the feature match of the day. The brothers both played on the Audi Quattro team, who narrowly beat Audi Ultra.
Kate and william spent most of their day chasing their young cocker spaniel pup Lupo around the grounds, in Ascot, while Harry was spotted pulling faces at one young baby after the match.
VIPs present included Gemma Arterton, Jamie Campbell-Bower, Rory Bremner, Tom Hardy, Anna Friel, Rhys Ifans, Chris O'Dowd, Jesse Eisenberg and Pixie Lott, who performed at a party to close the event.