Fergie and Josh Duhamel celebrate the launch of Don "DB" Brooks' Don-A-Matrix Training method; AnnaLynne McCord is honored at the Drawing Hope International Masquerade Gala; "Grey's Anatomy" hosts The Songs Beneath The Show benefit party; the beautiful people of "90210" have a Season 4 wrap party at Pink Taco; Jane Lynch hosts the kick-off event for Adopt The Arts; Julia Roberts and Lily Collins step out for the Los Angeles premiere of Mirror Mirror—St. Patrick's Day wasn't the only reason to have a party over the weekend, and we've got all the details on the biggest events that went down in Los Angeles and the notables who attended them in this edition of Last Night's Parties!

[Gillian Zinser, Jessica Lowndes, Shenae Grimes via]

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Janice Dickinson Russell Simmons AnnaLynne Mccord Will.I.Am Kim Raver Marcia Gay Harden Jessica Stroup John Stamos julia roberts sara ramirez Sandra Oh Matt Lanter Shenae Grimes Jessica Lowndes Jane Lynch Lily Collins Armie Hammer Brett Ratner Josh Duhamel Gilles Marini Donovan Leitch Tia Carrere Mark McGrath Lori Loughlin Kris Jenner Ali Landry Phil Collins Sharon Lawrence Molly Ringwald Wendie Malick Kylie Jenner Billy Morrison Kiernan Shipka Ariel Winter Gillian Zinser Matt Sorum Eva LaRue Glenn Hughes James Pickens Jr. Justin Chambers Kevin McKidd Christopher McDonald Pink Taco Michael Steger Sarah Drew Renee Olstead Stefanie Scott Courtney Hansen Marisa Coughlan Sean Bean Kyle Massey Ryan Ochoa Tarsem Singh Tucker Tooley Victoria Justice. Cody Simpson Shantel VanSanten Garrett Morris Drew Seeley Katie Lohmann Stacy Ferguson Jade Cole Michael Lerner Jonathon Schaech Adrienne Maloof-Nassif Dave Foley Alexis Knapp Holland Taylor Daniel Musto Erin Harris don-a-matrix training Drawing Hope International Masquerade Gala Dominic Purcell Christopher Massey Arianne Zuker Grey's Anatomy: The Songs Beneath The Show Chandra Wilson 90210 Season 4 Wrap Party Adopt The Arts Steve Stevens David Draiman Adrian Young Gilby Clarke Aoki Lee Simmons Ming Lee Simmons Camille Winbush