Lots of famous faces were out in NYC over the weekend to take in the US Open. Tennis lover Anna Wintour had her eye on her friend and your favorite shirtless player  Roger Federer, while others like Gavin Rossdale , Nicole Kidman , and Keith Urban  took in matches of their own. The biggest headline of the weekend, however, was 17-year-old Melanie Oudin  who entered the tournament unranked and became the youngest American to make the US Open semifinals since Serena Williams in 1999! Sienna Miller  brought her guy George Barker, aka DJ Slinky Wizard, along for a game as well. They were partially occupied with their own PDA , which we've come to expect after their loved-up antics on a boat in Italy last month .
For more pics from the US Open, .