[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.

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The Guest List

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Taye Diggs• Eric Balfour• Lauren Conrad• Lady Victoria Hervey• Christina Aguilera• Sienna Miller• Marvin Hamlisch• david arquette• rosanna arquette• Tiffani Thiessen• Edi Gathegi• Larry King• Jason Wahler• The Four Seasons• Bob Weinstein• Barbra streisand• Joanna Krupa• John Cho• Kat Kramer• Izabella Miko• James Brolin• Daveigh Chase• Norman Lear• Lynda Carter• Belasco Theatre• Patrick Fugit• The Little Door• Penelope Ann Miller• The Beverly Hilton hotel• Bonnie Somerville• Malcolm Mcdowell• Missi Pyle• Alex Breckenridge• Brady Smith• International Medical Corps 2011 Annual Awards Celebration Honoring Actress Sienna Miller• The Beverly Wilshire Four Seasons Hotel• The Elder Scrolls V: Skyrim Video Game Launch Event• Briana Evigan• Carter Jenkins• Davida Williams• Johnny Whitworth• Larenz Tate• Nicole Laliberte• The All-American Rejects• "The Artist" Los Angeles Premiere After Party Celebrates With Bombay Sapphire At The Little Door• Ann Miller• Berenice Bejo• Beth Grant• Ed Lauter• James Cromwell• Jean Dujardin• Michel Hazanavicius• Sapphire.• Cedars-Sinai Board Of Governors Honor Barbra Streisand And Robert Barth - Arrivals• lan Bergman• Kenny G• Marilyn Bergman• Sally Kellerman• Shawn King.