Charlize Theron and Gwen Stefani brought a bit of Hollywood glamour to the men's semi-finals at Flushing Meadows accompanied by their long-term partners Stuart Townsend and Gavin Rossdale.
Oscar-winner Charlize and beau Stuart looked chic in their matching grey and black outfits and huge black sunnies.
Cute couple Gwen Stefani and Gavin Rossdale, also fans of the game, turned up to watch Roger Federer and Juan Martin del Potro battle it out for the 2009 title.
The two clearly enjoyed spending some quality time together as they were seen laughing and playing around throughout the afternoon.
Other top tennis spots include Ben Stiller sat with producer Jeffery Katzenberg, a gorgeous looking Josh Hartnett in super-cool sunnies, and newlywed couple Bruce and Emma Willis.
Justin Timberlake and Donald Trump were also seen in the stands watching the game as was model Christie Brinkley and renowned American designer Ralph Lauren.
Last, but not least, the Olsen twins arrived at the event sporting matching tousled blonde locks with cool shades as they watched the game from the VIP mezzanine - now that's the way to watch the tennis.
By Georgie Hindle