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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The 54th Annual Grammy Awards takes over the Staples Center; Paris Hilton and Afrojack attend EMI's Grammy after party; Tony Bennett and Diana Krall perform at Clive Davis and The Recording Academy's Pre-Grammy Gala; Ne-Yo and Compound Entertainment throw a Pre-Grammy midnight brunch; Kelly Clarkson and John Legend attend Sony Music Group's Grammy Reception at Cecconi's; Bruno Mars performs at Warner Music Group's Grammy Celebration hosted at Chateau; Jay-Z's Roc Nation holds a pre-Grammy brunch at Soho House; MusiCares honors Paul McCartney as person of the year and raises $6.5 million for artists; Cash Money Records holds their 3rd annual pre-Grammy Awards party with Lil Wayne and Drake; Flo-Rida and Pia Toscano rock the house at OK! Magazine's pre-Grammy event—Los Angeles was alive with music this weekend and we've got your inside scoop on all the festivities and the celebrities who attended them in this edition of Last Night's Parties! More»

[Kirsten Dunst, Elle Fanning via] Emily Blunt, Kate Beckinsale and Colin Firth have date night at the opening of Stephen Merchant's new comedy show on La Cienega; Elle Fanning hosts an intimate dinner at Chateau honoring the Rodarte sisters with Kirsten Dunst, Sophia Coppola and others as guests; The Butterfly Gala takes over the SLS for a night of fashion appreciation and cocktails to benefit Children's Hospital Los Angeles—while most were still pooped from the Golden Globes, see which notables made it out to play last night around town in this edition of Last Night's Parties. More»

Dennis Quaid and Aimee Teegarden step out for Beneath The Darkness; Emily Blunt kicks off a Palm Springs Film Festival; Emmy Rossum, William H. Macy, Kristen Bell, and more celebrate two Showtime original series premieres; Ewan McGregor, Channing Tatum hit the Haywire premiere and after party hosted by Playboy—Wednesday and Thursday night were all about the business we call show here in L.A. and we have all the details in this pre-weekend edition of Last Night's Parties. More»