Friday

Caught in the Act!

03/28/2008 at 06:00 AM EDT

• Kate Bosworth, mixing with a star-studded crowd (including Mary-Kate Olsen and Clive Owen) during a Calvin Klein sponsored bash at New York's Mercer Kitchen following a screening of her movie, 21. The actress was happy to hang out with Helena Christensen as revelers feasted on salmon, French fries and lots of cookies and pastries in the underground restaurant. Meanwhile, Olsen stayed deep in conversation with friend Derek Blasberg – tucked away in the back – and 21 star Jim Sturgess stuck close with his girlfriend, Mickey O'Brien. Later, the crowd moved to Submercer, a tiny subterranean bar that guests could enter from inside the restaurant – continuing the celebrations late into the night.

• Kristen Bell, spending an afternoon with three friends, taking the backlot tram tour at Universal Studios Hollywood.

• Adrien Brody, casually checking out art with a male friend at the Armory Show preview party in New York. Also there (separately): Matt Dillon, discussing specific pieces with dealers and looking very intense as he checked out the art.

Adrien Brody and Elsa Pataky

Ronald Asadorian / Splash

• Jennifer Aniston, Courteney Cox Arquette, Eva Longoria Parker and Orlando Bloom, chatting over chips and guacamole in an upstairs VIP booth at a party in Hollywood to raise awareness for the Epidermolysis Bullosa Medical Research Foundation.Meanwhile, downstairs at Longoria Parker's new restaurant Beso: Host Ken Paves caught up with clients Jessica and Ashlee Simpson over pizza in the booth they shared with pals CaCee Cobb and boyfriend Donald Faison. And nearby, Kate Beckinsale and director husband Len Wiseman shared their booth with Rose McGowan and her director fiancé Robert Rodriguez.

• By LISA INGRASSIA, MARISA LAUDADIO, MELISSA LIEBLING-GOLDBERG and JEFFREY SLONIM

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