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!

CHELSEA & MARK

While the action on the court was intense – American champ Venus Williams beat her third-round opponent Mandy Minella of Luxembourg – newlyweds Chelsea Clinton and Marc Mezvinsky take a match break to smooch at the U.S. Open Tennis Championship in Flushing, N.Y., on Sept. 3.