Lake Bell, Aisha Tyler and Rob Schneider celebrate the Golden Trailer Awards; Elton John performs for guests like Rod Stewart, Kelly Osbourne, Neil Patrick Harris, Tommy Hilfiger, and more at the Race To Erase MS Gala; Ellen Hollman, Katrina Law and others attend a BritWeek celebration of "Downton Abbey"; Jason Bateman, Portia De Rossi and fellow Bluth family members step out for an "Arrested Development" press event; Amber Valletta, Angie Harmon, Monique Lhuillier and other fashionistas toast the forthcoming Wallis Annenberg Center for the Performing Arts with Ferragamo at Gagosian Gallery; Cobie Smulders, Mike White, and more dance for cancer research—get caught up on the weekend's top happenings in this edition of Last Night's Parties.

Kevin Bacon, Kyra Sedgwick, and Natalie Zea walk the red carpet at a screening event for "The Following"; Portia de Rossi, Jason Bateman, Will Arnett and the rest of the Bluth clan celebrate the Season 4 premiere of "Arrested Development" (!!!) and we could not be more excited; Judd Apatow, Carl Reiner, and Mel Brooks kick off #ComedyFest; Roxane Mesquida, Josephine de la Baume, and others hit a special screening for Kiss of the Damned; Princess Alexandra Von Furstenberg, Angella Nazarian, and more attend the Women A.R.E. Salon event—get the rundown on Monday's top events in this installment of Last Night's Parties.

Victoria's Secret Angels Karlie Kloss, Candice Swanepoel and Alessandra Ambrosio toast the 2013 Swim Collection with Steven Tyler, Angela Lindvall and more; Freddie Highmore, Nicola Peltz and Vera Farmiga celebrate A&E's upcoming "Bates Motel" series; Kirsten Dunst, Jim Sturgess and Cary Elwes step out for a special screening of Upside Down at the ArcLight in Hollywood—get caught up on all of Tuesday's top events in today's edition of Last Night's Parties.

Sundance 2013 kicked off this weekend, and film buffs flocked to Park City again this year. From Dave Groh's sold-out concert at Park City Live with Stevie Nicks, to Jessica Biel and Ringo Starr hanging out at The Westway, to Avicii and Matisyahu's blow out performances, here is a round up of some of the top bashes from Sundance's first weekend.

Go HERE and HERE for more photos by Alex Plank and Inae Bloom and tag yourself and your friends!

Unearthing a mysterious unmarked box of photos from the 60s at an estate sale would appear to be an unremarkable find, unless of course they're of the founding members of one of the greatest and most legendary rock bands of all time. Then it's major, as is the case for the stack of shots of Mick Jagger, Charlie Watts and Keith Richards circa 1965, discovered by some exceedingly lucky individual who can probably retire very comfortably to Cabo now, and shown to the public for the very first time last night at the opening reception for Found: Photographs of the Rolling Stones. More»

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»

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»

A plunging neckline-wearing Jennifer Aniston, Elizabeth Olsen, Amber Heard, and Reese Witherspoon step out for Elle's salute to women; Kristin Cavallari celebrates her new gig with Chinese Laundry at The Redbury; Julie Bowen and Jason Alexander attend a cabaret to raise funds for breast cancer research; Lauren Santo Domingo, Selma Blair, and a bunch of other chic people gather in Bel Air to party with Derek Blasberg—special things happened all over town yesterday so get all the details in this edition of Last Night's Parties.

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A photo of a sign from one of the #Occupy demonstrations has been circulating the interwebs that we'd like to point out in case you hadn't seen it. Obviously the Occupy movement's message carries great weight and speaks to the greater needs of this country's economic health and well-being. Demands to end our wars and stifle corporate greed have become the major causes behind Occupy protests across the nation. But these demonstrations have also become forums to air some peripheral grievances we can relate to, like the need for more "Arrested Development" in our lives. More»

Last night Alexander Skarsgard and Kirsten Dunst came to the screening of Melancholia, Scarlett Johansson hosted an event for Scott Stringer at the Jane Ballroom, Sarah Jessica Parker went on a treasure hunt with Andy Cohen, "Dirty Girl" screened then partied at the Jimmy and so much more! Last night's parties were all about partying for a cause. More»