Amber Heard, Diana Agron and Raquel Welch join Vanity Fair and Montblanc at the Hotel Bel-Air; Harvey Weinstein, Jessica Chastain and James Cromwell celebrate the 40th anniversary of Charlie Chaplain's honorary Oscar; Kate Beckinsale, Chloe Moretz and Rooney Mara attend the Costume Designers Guild Awards; and Amanda Seyfried, Jennifer Carpenter and Richard Greico (!) walk the red carpet in Hollywood for the L.A. premiere of "Gone"; Pharrell hosts a dinner party with Bevy Smith, Terry Richardson, Usher, and Charlize Theron: check out all the details of what went down on "Fat" Tuesday in Last Night's Parties!

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Sundance 2012 is off and running - and despite the icy storm that covered Salt Lake City, party hoppers bounced from place to place successfully. From Drake's performance at the Bing Bar, to Lil' Jon and Paris Hilton hanging out at Tao, to the Bertalli Meal Soup Chalet, to Marina Ambramovic's silent party, to the "Black Rock" dinner party and more, Sundance's parties were all about the film buffs. For more coverage, check out our correspondent Party Baby for the latest news! More»

Dita Von Teese, Jenna Elfman and more hit Luis Barajas and Emmy Rossum's Winter feast/cocktail party; Starz! rolls out the black carpet for the premiere of new original series "Spartacus Vengeance" in Hollywood; John Baldessari, Joel Silver, and Diane Keaton step of for the debut of Rodarte's newest collaboration with LACMA; Steve Aoki has a record release party; Mr. & Mrs. Smith throw a chichi launch party for their new travel guide book at Soho House; the Winklevi turn up at Connor Cruise's 17th bday bash at the Clippers game—it was just another Wednesday night L.A., let's discuss in this edition of Last Night's Parties. More»