Sundance Party Circuit

Hugh Dancy and Claire Danes

"My character has Asperger syndrome, so he'd probably be deeply freaked out if he came to Sundance," said Adam star Hugh Dancy, who celebrated the sale of his movie with girlfriend Claire Danes.

Minnie Driver

Minnie Driver

(in M Missoni) pulled double duty to help promote her Sundance flick, Motherhood. After attending the red carpet premiere of the film, Driver headed to the St. Ives spa and gallery, where she unleashed her inner chanteuse to entertain the after-party crowd.

Kim Kardashian and 50 Cent

Rapper 50 Cent welcomed guests like Kim Kardashian, Chris Rock and Kyra Sedgwick to a dinner held at the VitaminWater Sundance house. After the meal 50 hit the stage to entertain the crowd, performing "In da Club" for birthday boy Jim Carrey.

Nigel Barker and Adrienne Bailon

America's Next Top Model

judge Nigel Barker invited guests like Cheetah Girl Adrienne Bailon, Paris Hilton and Guns N' Roses guitarist Slash for dinner and discourse during the A Sealed Fate? event at the Bon Appetit Supper Club. "The hunt of baby seals is a horrible practice and it has to stop," said Barker, who filmed a documentary that exposes the brutality of the seal trade in Canada.

Justin Kirk, Elizabeth Reaser, Michelle Trachtenberg and Peter Callahan

After the premiere of Against the Current, co-stars Justin Kirk, Elizabeth Reaser and Michelle Trachtenberg joined director Peter Callahan for a post-screening party at Village at The Lift.

Emma Roberts

Fresh from the Hollywood premiere of Hotel for Dogs, Emma Roberts landed in Park City for the premiere of Lymelife. "It's a much edgier movie," the actress-who hit the after-party for the film at Wester Interiors-said of her Sundance flick.

Amy Poehler and Emily Blunt

British beauty Emily Blunt was on hand to help Amy Poehler celebrate the Sundance premiere of Spring Breakdown during a bash at the T-Mobile G1 Diner inside The Village at the Yard. "The baby's at home," said new mom Poehler, who stayed late enough to watch Blunt take an inner tube ride down the outdoor sledding hill.

Ben Affleck

Before heading to Washington, D.C. for the inauguration, Ben Affleck made a quick stop in Park City to present the documentary Reporter, which he executive produced.

Paris Hilton

After making at splash at Sundance in 2008, Paris Hilton returned for another week of festival fun. The heiress, who arrived in Utah by private jet, was the life of the party on the opening night of the AXE Fix Club, where DJ AM provided the evening's soundtrack.