Just Chillin'

updated 02/05/2007 AT 01:00 AM EST

originally published 02/05/2007 AT 01:00 AM EST

Sure, the Sundance Film Festival is all about celebrating independent film, but when Justin Timberlake hit Park City, Utah, with other Hollywood invaders, he had another agenda: toasting a special woman in his life—his mom, Lynn Harless. For her 46th birthday, the pop star, promoting his movie Black Snake Moan, threw a dinner party at Shag in the Snow, the Sundance outpost of the L.A. club Shag, on Jan. 21. After leading 15 guests in a chorus of "Happy Birthday," Timberlake arranged for Harless to be pampered at the Desert Essence Organics spa. "He just seemed happy to be with his mom," says an observer. The night before, Heroes star Milo Ventimiglia, Ryan Reynolds and lovebirds Ginnifer Goodwin (of HBO's Big Love) and Chris Klein partied at the American Eagle White Out Party while Jared Leto—star of Chapter 27, in which he plays John Lennon's killer—jammed with his band, 30 Seconds to Mars.... Speaking of rock stars, Bono made a low-key Sundance appearance on Jan. 22, slipping into Bistro 412 on Main Street and sipping Chardonnay with two pals.... Keri Russell, starring in the comedy Waitress, was working the festival while pregnant with her first child. "So far it's been nice and easy," she said.... New dad Peter Sarsgaard came without fiancée Maggie Gyllenhaal or daughter Ramona, 3 months. Plugging the drama Year of the Dog and short film High Falls, the Sundance vet explained how to work the event like a pro: "This morning I got out of bed, rolled down the hill, did a half twist with an axel, stuck the landing in the chair and did my first interview." ... While others pushed their movies, Teri Hatcher and Katherine Heigl seemed to hit every swag suite, and festival newbie Antonio Banderas, director of the Spanish language film Summer Rain, was getting the Park City vibe. "How has it been? Well, they are giving me gifts!" he said. "I love this place!" And added quickly: "Because I love this festival!"

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