Prince William's wife also plays the sport recreationally, but she hasn't had much time to work on her backhand since becoming a mum. On Sunday, the royal couple chatted with 2014 Wimbledon champ Novak Djokovic, and Kate admitted her tennis game isn't quite what it used to be!
When the future king jokingly asked his wife who wins more, she replied diplomatically that it's about "even" between the twosome.
Novak, who is apparently a fan of the royals, too, knew that Pippa Middleton was a tennis fan. He mentioned this to Kate, who confirmed that her kid sister is indeed "very keen" on the social sport.
Of course, the Middletons aren't the only stars who came out to see Novak take on Roger Federer in the men's singles final. Samuel L. Jackson, Victoria and David Beckham, Chris Hemsworth and Elsa Pataky and Hugh Jackman and Deborra Lee-Furness were also spotted in the stands Sunday.
With a crowd like that, everybody wins!