SIGHTING: Celebrities watch Federer win his fourth round match

FedFans Gavin Rossdale + Gwen Stefani

Like Andy Roddick, Roger Federer can bring the stars out to Arthur Ashe Stadium as he did last night for his 6-3, 7-6 (4), 6-3 fourth round win over 13th seed Jurgen Melzer. He'll face a huge obstacle, in all ways, on his path to a sixth US Open title when he battles Robin Soderling in the quarterfinals, a rematch of their meeting Roland Garros in the same round won by the Swede.

One quick note: It appears Gwen Stefani + Caroline Wozniacki are either sharing nail polish bottles or, worse, visiting the same manicurist. And we all know who's to blame. Carry on.

Alex Rodriguez

Cameron Diaz

Pete Wentz + Ashlee Simpson

Boris Becker

 [Photo(s): Getty Images]

SIGHTING: Gavin Rossdale and Mark Philippoussis partner for doubles tennis action

Gavin Rossdale, Bush frontman & husband to Gwen Stefani, and tennis star turned reality TV chump Mark Philippoussis partnered for doubles action at this past weekend's The Chris Evert/Raymond James Pro-Celebrity Tennis Classic held at the Delray Beach Tennis Center.

Based on these images, which one of these men looks like he actually played professional tennis?