Last night in NYC, the New York Academy of Art threw their Tribeca Ball with guests like Robert DeNiro and Solange Knowles, Marc Jacobs sponsored an "urban hoedown" complete with fashionistas like Giovanna Battaglia and Michelle Harper, Neon Trees performed at the Bowery Ballroom, the Cinema Society hosted the premiere of "Safe" at PH-D at Dream Downtown, "The Raven" held a special New York screening at Sunshine Ladmark, and more! Last night's parties were all about getting "gown and dirty." More»

Heidi Klum, Tom Hanks, and Rita Wilson play dress-up and sing karaoke to raise funds for UNICEF; Santa Monica Museum of Art's PRECOGNITO Gala draws Emmy Rossum, Ben McKenzie, and a Mary-Kate-less Ashley Olsen to preview the INCOGNITO art exhibition; Lana Del Rey, Quincy Jones, Owen Wilson and Jared Leto hit up the UCLA Institute of the Environment and Sustainability—get all of this and more and to see who got a head-start on weekend fun on Thursday in L.A. in this edition of Last Night's Parties. More»

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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HBO kicked things off at Circa 55, where guests like Jane Fonda, Guy Pearce, and Ewan McGregor, and winner Claire Dane munched on beef tenderloin and sipped martinis. NBC had A-listers Jon Hamm, Colin Firth, and Nicole Richie schmoozing under the stars at the Beverly Hilton rooftop - right across from where Harvey Weinstein kept the company of Golden Globe winners Meryl Streep and Jean Dujardin, as well as Leo DiCaprio and countless other guests at his annual party. See this and so much more on our Golden Globes after party round up... MORE>>

After the awards ceremony winded down, celebrities dispersed into the night and the red carpets were rolled out yet again, mostly decking the halls of the Beverly Hilton, where the majority of Sunday's after parties were held. HBO kicked things off at Circa 55, where guests like Jane Fonda, Guy Pearce, and Ewan McGregor, and winner Claire Dane munched on beef tenderloin and sipped martinis. NBC had A-listers Jon Hamm, Colin Firth, and Nicole Richie schmoozing under the stars at the Beverly Hilton rooftop - right across from where Harvey Weinstein kept the company of Golden Globe winners Meryl Streep and Jean Dujardin, as well as Leo DiCaprio and countless other guests at his annual party. More»

Nicole Richie, Mindy Kaling and Samantha Ronson welcome Pressed Juicery to WeHo; cover girl Kate Beckinsale hosts a dinner at the SLS for FLAUNT; Gelila and Wolfgang Puck, Devon Aoki, Brett Ratner and more celebrate Vertu's new luxury mobile device; Justin Bieber, Jake Gyllenhaal and the Kardashians catch the final Watch The Throne concert at Staples—last night was proof L.A. is not slowing down for the holidays, get all the details in this edition of Last Night's Parties. More»

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Pirelli celebrated the global launch of its 2012 Pirelli Calendar by Mario Sorrenti with a gala dinner last night at the Park Avenue Armory. More»

Lea Michele, Ashton Kutcher

Zac Efron, Michelle Pfeiffer and Katherine Heigl hit the premiere of New Year's Eve while Lea Michele and Ashton Kutcher dish out some vom-worthy red carpet PDA theatrics; Jane Lynch, Alec Baldwin and Will.i.am celebrate 30 years of People For The American Way; Anne Heche and Alia Shawkat attend a Sundance Institute mixer; Carmen Electra and others get pampered to support P.S. ARTS—it was a fully-loaded Monday here in L.A., let's talk about it in this edition of Last Night's Parties. More»

Rachel Zoe, Gwen Stefani in white lab coats

Kendall and Kylie Jenner, Decades boutique are the big winners at the Hollywood Style Awards; Pink shows off her new baby Willow with husband Carey Hart at the premiere of Happy Feet Two; Gwen Stefani wins our pick as best dressed of the weekend despite the mandatory lab coats at the annual MOCA Gala which was a strange affair by all accounts; Tilda Swinton, Sharon Stone help the Academy honor Oprah; Amy Adams and Jason Segel party with Miss Piggy at The Muppets Premiere; More»

Neil Patrick Harris, Rex Lee, RuPaul, Wilmer Valderrama, and Tori Spelling (don't ask) step out for the LGBT filmmaking community at the Outfest 2011 Opening Night Gala screening downtown; Martyn Lawrence-Bullard, Taryn Manning and Maria Menounos snack on sushi and shop bikinis as Melrose gets a new place to snag some sexy summer beach gear with the opening of the Shay Todd flagship—summer is a little slow but not that slow, so get all the pressing details on what went down Thursday in L.A. with today's edition of Last Night's Parties. More»