Ben Affleck, Steven Tyler, Naomi Watts, Nina Dobrev and a massive list of celebs came out to support designer John Varvatos' 10th Annual Stuart House Benefit; Cara Santana, Jesse Metcalfe, Jordana Brewster, and co-stars of "Dallas" step out for a Q&A panel at the 30th Annual PaleyFest; Shenae Grimes, Sarah Hyland, Derek Hough, Lakers stars and other notables tested their luck for a good cause at the Lakers Casino Night Fundraiser benefiting the Lakers Youth Foundation; Julie Bowen, Ginnifer Goodwin, Adam Scott and a bunch of little kids read some books at the 4th Annual Milk And Bookies Story Time Celebration—see which stars were out and about supporting the causes of their choice over the weekend in this edition of Last Night's Parties.

Bella Thorne helps celebrate Latinos in Hollywood at The London; a youth orchestra takes over Barney's New York in Beverly Hills for a fundraising event hosted by Simon Doonan; Wendi McLendon-Covey and Selita Ebanks step out for the Give & Get Fete fundraiser at the SLS; George Clooney and Stacy Keibler squash breakup rumors with PDA while supporting Ben Affleck along with Jennifer Garner, Bryan Cranston and more at the premiere of Argo—get your final dose of event rundowns before the weekend in this edition of Last Night's Parties.

Ben Stiller and Jonah Hill celebrate the Hollywood premiere of The Watch; Britney Spears and other stars of FOX's fall lineup take the hot seat at the TCA's Summer Press Tour; FOX throws their All-Star Party at Soho House for stars like Zooey Deschanel, Seth MacFarlane, Katy Perry and other locals with great taste in music go see Haim open for The xx in Hollywood—here's how L.A. pretty much covered all the entertainment industry bases Monday with movies, TV and music in this installment of Last Night's Parties. More»

Ben Stiller, Christine Taylor, Jonah Hill and more celebrate the Hollywood premiere of The Watch; Mindy Kaling, Britney Spears and other stars of FOX's fall lineup take the hot seat at the TCA's Summer Press Tour; FOX throws their All-Star Party at Soho House for stars like Lea Michele, Zooey Deschanel and Seth MacFarlane; Katy Perry and other locals with great taste in music go see Haim open for The xx in Hollywood—here's how L.A. pretty much covered all the entertainment industry bases Monday with movies, TV and music in this installment of Last Night's Parties. More»

Zoe Kazan and Paul Dano celebrate the premiere of their movie, Ruby Sparks at the Egyptian Theatre; Al Green die-hards experience some old time lovin' and soul at The Greek with performer Allen Stone; KIIS FM, Teen Choice and Backstage Creations keep the teenage dream alive with awesome swag bags at their pre-award show gifting lounge; Stephen Verona, Arno Elias and Maggie Coulombe combine forces for a night of beauty and art at Mouche Gallery presents "Escape With Me"--goodies and beauty and music, oh my! We've got the scoop on Thursday in this edition of Last Night's Parties. More»

Seth MacFarlane, Mark Wahlberg and Mila Kunis attend the L.A. premiere of MacFarlane's first feature film; Quincy Jones joins his daughter Rashida and Andy Samberg at the Downtown premiere and after party for Celeste & Jesse Forever; Heart rocks the first edition of a new music and photography series in Century City. Thursday night's parties had plenty of music, movies and celebrities for everyone, check out all the details in this edition of Last Night's Parties.

Seth MacFarlane, Mila Kunis, Mark Wahlberg at the "Ted" premiere More»

Morgan Freeman, Cher and others step out to the premiere and after party for Rob Reiner's latest film; Kelly Osbourne, Bret Easton Ellis, Lykke Li and more go to a David Lynch-hosted cocktail party featuring sets by The Kills and Diplo; Olivia Munn, Aaron Sorking, Larry David and others celebrate the premiere of HBO's new series "Newrsoom"—get the details on Wednesday's biggest events in L.A. in this installment of Last Night's Parties. More»

Last night in NYC, Jessica Stam joined June Ambrose at the American Ballet Theatre's Spring Gala, Santigold performed at Irving Plaza with surprise guests Pharrell and Andy Samberg, Rihanna and Neil Young kicked off the Robin Hood Foundation Benefit, Ricky Martin hosted an intimate fundraiser for President Obama, and more. Last night's parties were all about the performers! More»

Last night in NYC, the Kardashian clan and Kanye West were in town to support Scott Disick's RYU restaurant opening, Anna Wintour and Oscar de la Renta were at the Waldorf Astoria to honor photographer, Bill Cunningham, Malin Akerman and Topher Grace celebrated the premiere of "Giant Mechanical Man," and so much more. Last night's parties were all about the galas, premieres, and Kardashians! More»

Over the weekend in NYC, Abbie Cornish celebrated the premiere of her film "The Girl" with Shaun White, Emma Watson showed up head to toe in Miu Miu for the "Struck by Lightning" premiere, Eric Bana partied at Abe & Arthurs for the "Deadfall" after party, Jason Segal and Michelle Williams cozied up together at yet another after party, and more! Last night's parties were all about getting down at the Tribeca Film Festival. 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»