Cameron Diaz watched Federer doing what he does best, win
Stars making an appearance in major tournaments is nothing unusual.
Only, if the tournament in question is the US Open, the focus intensifies.
If the fans are happy to see their favourite celebrities, the paparazzi looks out for dope.
Rediff.com gives you a lowdown of the star quotient at Flushing Meadows this year.
Cameron Diaz and Ashlee Simpson were spotted during Roger Federer's fourth round match against Jurgen Melzer.
While the Swiss was busy decimating his Austrian opponent, the pair was spotted embracing and sharing a courtside chat.
Image: Actress Cameron Diaz watches Roger Federer in action
Gwen and Gavin are known tennis lovers
Gwen Stefani and husband Gavin Rossdale also made an appearance.
The couple is known for their love of tennis.
The latter was, earlier in the day, spotted with their two young children, Kingston and Zuma.
The kids had their faces painted.
Image: Singer Gwen Stefani and her husband Gavin Rossdale applaud Roger Federer's win over Jurgen Melzer
Will Ferrell loves his tennis too
Actor Will Ferrell also made his presence felt at the US Open.
The Saturday Night Live star was in attendance for two straight days, for both the day and night sessions.
The comedian is a regular attendee each year at Flushing Meadows.
Image: Actor Will Ferrell
Kanye West also had some fun
Musician Kanye West was also in attendance during the first week.
He was spotted with model Selita Ebanks.
Kanye wore a pair of Persol 714 Sunglasses -- made popular by Steve McQueen in the 60's -- with a white collared striped dress shirt and white pants.
Sopranos actor Steve Schirripa was also among those seen at the venue.
Image: Musician Kanye West cheers from a private box
Baldwin combines pleasure with a cause
Baseball legend Hank Aaron and Hollywood star Alec Baldwin were also spotted, watching Kim Clijsters play Samantha Stosur in the quarters.
Baldwin, who has starred in films such as Aviator and won an Emmy for NBC's 30 Rock, partnered with the USTA on its expanded Green Initiatives Program last year.
A New York native, he is a regular attendee at the US Open.
Image: Baseball great Hank Aaron sits in front of actor Alex Baldwin as they watch Kim Clijsters of Belgium play Samantha Stosur of Australia