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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The Guest List

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Mena Suvari• Jason Biggs• Monet Mazur.• Lynn Whitfield• Neil Patrick Harris• Hal Rubenstein• Tim Daly• Robin Bronk• Tristan Wilds• Grauman's Chinese Theatre• Nia Vardalos• Christos Garkinos• John Cho• Yotam Solomon• Matteo Marzotto• Kal Penn• Adam Shankman• George Kotsiopoulos• Magda Berliner• Chris Klein• Tichina Arnold• Fernanda Romero• Ariel Winter• Abigail Spencer• Jason Ritter• Evan Handler• Ali Cobrin• Caroline D'Amore• Merle Ginsberg• David Burtka• Mr. Chow Beverly Hills• Patton Oswalt• Ian Gomez• Brian Smith• Danny Trejo• David Krumholtz• Hector Elizondo• Emmanuelle Vaugier• Glynis Costin• Olivia D'Abo• Azita Ghanizada• Andrea Bowen• Crystal Lourd• Melissa Ordway• Lawren Howell• "A Very Harold & Kumar 3D Christmas" Los Angeles Premiere• Arlen Escarpeta• Danneel Harris• Deray Davis• Eric Winter• Hayden Schlossberg• Jon Hurwitz• Richard Riehle• Roselyn Sanchez• Thomas Ian Nicholas• Thomas Lennon.• Saks Fifth Avenue Presents Vionnet Spring 2012 Runway Collection• Anastasia• Booth Moore• Decades Hosts Hal Rubenstein Signing• Corey Lynn Calter• Kevan Hall• Sandra Roderick• Art & Soul:Stars Unite To Celebrate and Support the Arts• Sony Store• Clement Von Franckenstein• Ellen Hollman• Gomez• Vik Sahay.