One Love: U.S. Open Couples!

From Chelsea Clinton & Mark Mezvinsky's PDA to Gwen Stefani & Gavin Rossdale's cheer section, see which star pairs are Grand Slam fans!

WILL & VIVECA

Looks like tennis is just about the only thing that can get funnyman Will Ferrell to put on a serious face. The Other Guys star and wife Viveca Paulin checked out James Blake's match against Serbian Novak Djokovic, who beat the American player in three sets. (Maybe that explains their long faces?)