Go HERE for more photos by Desiree Ann and tag yourself and your friends!

Last night at The Beverly had numerous causes for celebration: not only was it the joint birthday blowout for Michelle Marie, Taryn Manning and Courtenay Semel to complete the spicy Scorpio trifecta, but we also discovered something that my jeans and I would have really benefited from my freshman year of college: diet vodka. More»

[Christina Aguilera, Mathew Rutler via] Sienna Miller gets honored for her humanitarian work; Christina Aguilera, David Arquette and some others step out for a very Bolthouse video game launch blowout; Malcolm McDowell, Bob Weinstein and more have a post-premiere celebration at The Little Door; Babs Streisand is honored at the Cedars-Sinai Board of Governors gala—there was quite a range of events last night, let's discuss in this edition of Last Night's Parties. More»

Go HERE for more photos by Nicole Eisenberg and tag yourself and your friends!

L.A. got infused with a bit Marrakesh flavor last night with the opening event of Minnie Mortimer and the Chic Shop by Hillary Thomas Designs event, "An Evening at El Morocco." More»

Isabel Lucas, Henry Cavill, Freida Pinto [via]

AFI Fest continues with Thomas Jane, Rob Lowe, and Jeremy Piven's film screening; Aussie import Isabel Lucas rocks the red carpet for the Immortals 3D premiere with Kellan Lutz, Freida Pinto and Mickey Rourke; Garcelle Beauvais, Jennifer Love-Hewitt and more get pampered on the roof of The London; Zooey Deschanel and our new favorite dresser Ashley Madekwe, along with may others, step out for TV Guide's "Hot List Party" in West Hollywood—it was just another Monday in L.A. but there was plenty of action so get all the details in today's installment of Last Night's Parties.

Kate Hudson, Cameron Diaz, Drew Barrymore [via]

Michelle Williams, Jennifer Garner and more attend special screenings of their films showing in the 2011 AFI Fest; Robert Pattinson, Jon Hamm and more honor the work of those behind the scenes in entertainment; the first ever LACMA Art + Film gala co-hosted by Leonardo DiCaprio brings out one of the most star-studded crowds we've ever seen, with everyone from Zac Efron, Clint Eastwood and Zoe Saldana, to Stevie Wonder, Julian Schnabel and Jane Fonda—we, could keep going but we'll stop there, so come take a look at everything that went down this busy weekend in L.A. in a super-size edition of Last Night's Parties.

[Rosie Huntington-Whiteley, Dita Von Teese] Thursday evening, the all-familiar second floor of Barney's in Beverly Hills was transformed from designer women's retail haven into swanky cocktail party space. Rather than racks of the latest from The Row, Marni, and Chloe, guests found themselves amongst a sophisticated crowd of fashionable Angelenos, famous faces and handsome men carrying trays of champagne and hors d'oeuvres for the 20th anniversary of Christian Louboutin and launch celebration of his new book. More»

Neil Patrick Harris, Mena Suvari, Kal Penn and John Cho step out for a 3D holiday Harold & Kumar movie premiere; Vionnet and Saks Fifth Avenue take over Mr. Chow for a champagne fashion party; Decades hosts an intimate book signing for InStyle editor Hal Rubenstein's new hardcover fashion tome; Nia Vardalos, Jason Ritter and more attend the Art & Soul book release and signing celebration at Sony—get the details on what went down in L.A. Wednesday in this installment of Last Night's Parties.

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[Dave Gilboa, Ashton Kutcher, Neil Blumenthal photo via WireImage courtesy of Bradbury Lewis] Eva Longoria and Selena Gomez step out for a fundraiser co-hosted by Jason Segel and  Kermit the Frog; Stevie Wonder, Pras and more perform at the "Never Again" benefit concert; Russell Crowe and Eli Roth catch a Skylar Grey show at the Roxy; Emmy Rossum, Danny Masterson and others attend an eyewear line event at Confederacy hosted by Ashton Kutcher—for the people who somehow made it out the day after Halloween, there were some events around town and we have your details in this edition of Last Night's Parties.

Go HERE for more photos by Erin G. Wesley and tag yourself and your friends!

We're not done reliving our Halloween experiences and are really enjoying clicking through all the photos of everything that went down in honor of the holiday. And we would be remiss if we didn't give due recognition to the Halloween night throwdown at Jane's House which got prettyyyy, prettyyyyyy, pretty cray. More»

[Adam Levine as Axl Rose, Anne V, James Valentine as Andrew WK via] Perhaps you went the raver route, raged with Bag Raiders, kept it more lowkey on the Westside, or made it out to our insane Halloween Boogie, but where were our dear the celebrities partying to celebrate the holiday? Monday night, they were most likely at Maroon 5's annual Halloween party sponsored by Bacardi in Hollywood Forever Cemetery. We've been seeing some really awesome costumes in our party photos from all of these 'ween festivities so we expect nothing less from famous people with generous Halloween costume funds and personal assistants. More»

Go HERE for more photos by Steven Meiers and tag yourself and your friends!

Friday night we partnered with Minx Society to take over some very familiar territory at Room 86 and threw an End of Days Halloween Boogie. Not to brag or anything, but it was kind of the sickest one of the lot. We had chickens, Ninja Turtles, Baywatch babes, Fembots, and also by far the hottest girls of all the 'ween festivities. More»