Celebs at the US Open

Actress Charlize Theron and her boyfriend Stuart Townsend attend the semifinals match between Novak Djokovic, of Serbia, and Roger Federer, of Switzerland at the U.S. Open tennis tournament in New York, Sunday, Sept. 13, 2009.

Kathy Willens / AP Photo

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Designer Ralph Lauren and guest watch the match between Rafael Nadal of Spain and Juan Martin Del Potro of Argentina during day fourteen of the 2009 U.S. Open.

Nick Laham / Getty Images

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The actress and the country singer got cozy on the sidelines of the U.S. Open on Sept. 7 while watching Roger Federer beat Spain’s Tommy Robredo in straight sets 7-5, 6-2, 6-2.

Jeff Christensen / AP Photo

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The Sex and the City star, whose antics around Manhattan while shooting the film’s sequel have whipped the paparazzi into a frenzy, left the city behind to watch top seed Roger Federer play against Germany’s Simon Greul.

Emmanuel Dunand, AFP / Getty Images

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The New York Giants quarterback watched the intense match between Americans Andy Roddick and John Isner on Sept. 5, which saw the 6-foot-9-inch Isner take down the once-golden boy.

Paul J. Bereswill / AP Photo

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The actress and her boyfriend, British DJ George Baker (aka Slinky Wizard), attended Venus Williams’ match against Magdalena Rybarikova on Day 5 of the Open.

Chris McGrath / Getty Images

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The star of the recently released box-office bomb Extract took in the tennis action between Vera Zvonareva of Russia and Flavia Pennetta of Italy during the fourth round of the U.S. Open.

Darron Cummings / AP Photo

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The model took some time off before New York’s Fashion Week to support husband Andy Roddick during his match against John Isner.

Paul J. Bereswill / AP Photo

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Mirka Federer, wife of Roger Federer of Switzerland, and musician Gavin Rossdale—who’s also an accomplished tennis fanatic—rooted from the sidelines of Federer’s match against Tommy Robredo.

Matthew Stockman / Getty Images

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Will Ferrell and his wife, Viveca Paulin, watched Serena Williams beat Maria Jose Martinez Sanchez during the third round of the U.S. Open on Sept. 4. Is a tennis-themed comedy (a la Blades of Glory) in the works next?

Darron Cummings / AP Photo

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Singer Tony Bennett—looking as cool as ever—viewed Day 8 of the 2009 U.S. Open at the USTA Billie Jean King National Tennis Center.

Matthew Stockman / Getty Images

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Fresh off sitting in the guest seat at the Late Show with David Letterman, where he mocked his own mercury poisoning, Jeremy Piven attended Day 3 of the U.S. Open.

Julian Finney / Getty Images

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The Satanic Verses writer attended Day 7 of the U.S. Open in Flushing.

Nick Laham / Getty Images

Celebs at the US Open

Nicole Kidman and Will Ferrell were just two of the stars who sat down to take in the action at this year’s U.S. Open. VIEW OUR GALLERY of the famous tennis fans in the stands.