Unable to defend her championship do to a nagging injury, Serena Williams turned up at Flushing Meadows to cheer on big sister Venus Williams during the US Open tennis tournament on Friday night (September 3). Splitting time between the players’ box and announcers’ booth, the world’s top player happily watched on as her sis beat up on Mandy Minella of Luxembourg in the third round matchup – as Venus won 6-2 6-1. And with the tennis being a bit uncompetitive, attention turned to Serena’s glammed up look including a hot red dress with fully done hair and makeup.

Having just kicked off another year of academic endeavors, Kylie Jenner gleefully strolled about Calabasas following the day’s lessons on Friday afternoon (September 3).

Still situated in the UK, Katy Perry was spotted greeting her adoring fans in London, England on Friday night (September 3).

Easing into the grind of everyday dance practice, Audrina Patridge was spotted out at a local studio in Hollywood, California on Friday afternoon (September 3). Clad in her fitness apparel, the former “Hills” hottie strolled outside with her “Dancing with the Stars” partner Tony Dovolani following their grueling preparatory routine. Tweeting to her recently announced dance mate pre-meetup, Miss Patridge wishfully wrote, “@TonyDovolani we should go rehearse at the beach today!! Hahah” Understandably worn down following their midday session, Audrina headed straight into relaxation mode, as she later tweeted, “Finally reached my destination!! Jacuzzi time”

Seeking out new ways to spend her free time aside from her previous partying ways, Lindsay Lohan headed out for a night at the movies in Hollywood, CA on Friday (September 3). Joined by a few friends, the “Georgia Rule” babe got the help of a security staffer as she made her way into The Grove to catch her just-released movie, “Machete”

Bringing an end to the week with a little family time, Emily Osment was spotted enjoying the lovely weather in Sherman Oaks, California on Friday (September 3). The 18-year-old “Hannah Montana” star looked adorable as she joined her parents for a tasty midday meal at the Cheesecake Factory

Enjoying some quality bonding time, Sarah Michelle Gellar and baby Charlotte Prinze were spotted out in Brentwood, CA on Friday (September 3). The adorable mother/daughter duo strolled about town, soaking up the summer sunshine as they grabbed up lunch at Coral Tree Cafe.

She’s very dedicated to her workout routine, and Hilary Duff was spotted heading to a Pilates class in Los Angeles, California on Friday (September 3). The “Beauty of the Briefcase” babe arrived just in time for class and about an hour later emerged from the studio, flashing a slight smile for the on-hand paparazzi.

No longer denying the fact that they’re a couple, Jesse James and Kat Von D were spotted making their way around West Hollywood, California on Friday (September 3). The Orange County Choppers CEO and his tattoo artist gal stopped to get some gas before holding hands as they headed off to grab up some lunch.