Movie premieres, freebies galore, days of skiing and nights of parties? It's that time of year again! Robert Redford's annual Sundance Film Festival kicks off tonight in snowy Park City, Utah, and the stars are already winterizing themselves for a week of festivities. All eyes will be on Mischa Barton on Wednesday as she makes her first red carpet appearance after her December DUI bust, at the premiere for Assassination of a High School President. Colin Farrell debuts his new comedy, In Bruges, with an after-party tonight. And of course, Paris Hilton, a ubiquitous presence at the annual fest, will be on hand. She's there to host a party for her new film, The Hottie and the Nottie, on Sunday night and, we suspect, load up on swag at the numerous gift suites when not hitting the slopes or the clubs. Emily Blunt, Ellen Page, Winona Ryder and countless more A-list names are also expected to brave the cold and join in on the fun at the festival.