The celebrating kept going long after the premiere of 21 in NYC last night. Kate Bosworth ditched her blazer and got giggly with her friend Helena Christensen, while Mary-Kate Olsen was looking adorable in her shiny belted jumpsuit. Elle Macpherson was also in the house, celebrating her new gig as as the next spokesperson for Revlon. All the celebs look like they're having a blast, and we can't Read more