US Open
Credit: Uri Schanker/WireImage; Anthony J. Causi/Splash News

The US Open Tennis Championships are still going strong, and while it’s hard to take our eyes away from the action (and fashion!) on the courts, we can't help but notice more than a few famous faces in the crowd. Pippa Middleton took in a game as part of her grand tour of New York, and actress Eva Longoria cheered on the action as well. Click through the gallery below to see who else has been hitting the courts!