Celebrities hit the US Open courts

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Celebs at the US Open
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Celebrities hit the US Open courts

Anna Wintour's love of tennis is no secret. Not only is the fashion icon good friends with Roger Federer, she recently featured Novak Djokovic in the coveted Vogue September issue.

(Photo by Uri Schanker/GC Images)

Forest Whitaker wasted no time at all! The Oscar winner stopped by Billie Jean King National Tennis Center on the first days of the tournament.  

(Photo by Jean Catuffe/GC Images)

Derek Jeter swapped the dugout for box seats on day 2 of the U.S. Open.

 (Photo by Uri Schanker/GC Images)

Condoleeza Rice enjoyed a match on Sept. 1. (Photo by Jean Catuffe/GC Images)

Vanessa Williams and her husband Jim Skrip were among the first to enter Billie Jean King National Tennis Center on Aug. 31. The actress rocked drop earrings and a fancy coif.

(Photo by Jean Catuffe/GC Images)

Amanda Seyfried looked fab cheering the players on in plastic sunnies.

(Photo by Jean Catuffe/GC Images)

Alec and Hilaria Baldwin cozied up in the stands on day 1 of the U.S. Open.

 (Photo by Jean Catuffe/GC Images)

Katie Couric and husband John Molner had a private moment under the stadium's bright lights.

 (Photo by Jean Catuffe/GC Images)

Ben Stiller and Christine Taylor-Stiller enjoyed some good ol' family time with daughter Ella Olivia Stiller (center).

(Photo by Uri Schanker/GC Images)

Martha Stewart pulled out a point-and-shoot camera at a match. Think she'll scrapbook her time at the 2015 U.S. Open?  

(Photo by Uri Schanker/GC Images)

Wanda Sykes donned a U.S. Open baseball cap as she enjoyed a match with her wife Alex.

(Photo by Jean Catuffe/GC Images)

Who knew One Direction member Liam Payne was such a tennis fan? The singer attended the games sans bandmates on Sept. 2.

 (Photo by Jean Catuffe/GC Images)

"Girls" star Jemima Kirke kept cool in a breezy sundress and ponytail.

(Photo by Jean Catuffe/GC Images)

Niall Horan of One Direction, who rocked an appropriate NY Yankees cap, sat with Jamie Foxx in Novak Djokovic's box  ... We would kill to be a fly on the wall!

(Photo by Jean Catuffe/GC Images)

Kelly Rowland intently watched Serena Williams' match on day three.

(Photo by Jean Catuffe/GC Images)

Adorable! Tony Bennett and his wife Susan Crow enjoyed day three of the tournament ... but where was Lady Gaga?  

(Photo by Jean Catuffe/GC Images)

"Without a Trace" actress Poppy Montgomery enjoyed a drink and let loose on day two of the tournament.

(Photo by Jean Catuffe/GC Images)

Andy Murray's wife Kim Sears looked on from the stands in a crisp button down and incredible blow-out.

(Photo by Jean Catuffe/GC Images)

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Tennis fans around the world are tuning in to the U.S. Open, which kicked off in Flushing, Queens, on Sunday. But entertainment fans, take note -- keep your eyes on the stands, and you might be able to catch a glimpse of some very famous faces.

SEE ALSO: Game, set, match! Famous faces abound at Wimbledon

Anna Wintour, whose Vogue office is based in NYC, was among the first to catch a match. The fashion icon is known for her friendship with Roger Federer and recently featured Novak Djokovic in her coveted September issue.

Other celeb sightings included Amanda Seyfried, Alec Baldwin and even One Direction Niall Horan, who sat next to Jamie Foxx in an elite box seat.

See who else took to the stands in the slideshow above.

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