Katie Holmes checked things out at Club Monaco in Beverly Hills Friday.

Jennifer Westfeldt and Jon Hamm posed together at a charity event in NYC on Thursday night.

George Clooney wore a fake nose and giant ear to join funny guys like Jon Stewart and Zach Galifianakis in LA last night to answer phones and collect more than $3 million during Comedy Central's Night of Too Many Stars: An Overbooked Concert For Autism Education. Jon was there live after playing host three weeks ago, when he and friends like Tina Fey, Jimmy Fallon, and Ricky Gervais recorded the actual special at NYC's Beacon Theater. Zach was able to attend during a break from shooting The Hangover 2, which will no longer feature a cameo from Mel Gibson and instead will have a special appearance from Liam Neeson. George's latest philanthropic gesture follows his goodwill trip to Sudan and last week's meeting with President Obama. He was also front and center for January's Hope for Haiti Now telethon, which raised more than $57 million.

Blake Lively, Penn Badgley, and Leighton Meester studied their lines in warm coats on the set of Gossip Girl in NYC today as Chace Crawford tackled things in just a suit. The whole Upper East Side crew has been busy filming all week, though they've made time to step out for various social events at night. Blake wore a hot red dress to party with her sister, while Ed Westwick went all the way to New Jersey for a spa bash. Matthew Settle, meanwhile, partied with John Legend and Seth Meyers at a Ferragamo event, and Taylor Momsen had to deal with a wardrobe malfunction while performing in London.

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Seth Meyers shook hands with host John Legend on the red carpet at the launch of Ferragamo WORLD in NYC on Thursday evening.

Rachel Bilson had her reusable shopping bags, including the charitable Paws for a Cause tote, in hand on her way into a market in Los Feliz, CA, yesterday. She stocked up on groceries in a similarly chic layered look earlier this week, but this time she traded her Hunter wellies for fuzzy Uggs. Fab recently got the scoop on her style secrets from her stylist Nicole Chavez, whom Rachel met while working on The O.C. The series is yielding another collaboration for Rachel, as she's joining forces again with Josh Schwartz for an hour-long TV comedy about a woman who can see dead people. First, though, she's set to star alongside Kate Bosworth in BFF and Baby.

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Halle Berry left a friend's house in LA bright and early on Friday morning.

Russell Brand and Katy Perry jetted from London to India yesterday to prep for their big weekend wedding bonanza, and today he joined friends like the UK comic David Baddiel for a safari at the Ranthambore National Park. It was one of the first adventures planned for Russell and Katy's guests, which include Katy's parents, Rihanna, and Brits like David Walliams and Jonathan Ross. Things are already off to a dramatic start, as photographers are accusing Russell's security of using unnecessary force while inside the animal preserve.