Star Magazine hosts the Hollywood Rocks party with Paris and Perez at Playhouse; Gwyneth Paltrow, Kim Kardashian and Stacy Keibler celebrate the opening of Tracy's Anderson's new fitness flagship studio; celebs and man's best friend party in an Anthropologie for Amber Riley's A Letter To My Dog book signing; Drew Barrymore and Lucky Magazine host the FABB West event for guests like Julianne Hough and Christa B. Allen; Dan Deacon and Tom Kuntz debut their "Bugs" exhibition at Sonos Studios—see who was out at Thursday's top events in this edition of Last Night's Parties.

Lydia Hearst Paris Hilton Chloe Sevigny Gwyneth Paltrow Betsey Johnson Julianne Hough lucky magazine Perez Hilton Drew Barrymore Diane Warren Kim Kardashian Tracy Anderson Molly Sims Rumer Willis Kathy Hilton harrison ford Catt Sadler Amy Smart Paula Abdul Kelly Osbourne Ken Paves Stacy Keibler Anthropologie Star Magazine Brian Grazer Gilles Marini montage beverly hills SLS Hotel Amber Riley Jason Ritter Autumn Reeser Conservation International Ashlan Gorse Sally Pressman Lauren C. Mayhew Caroline D'Amore Kym Johnson Fivel Stewart Willow Bay Nadia Bjorlin Christa B. Allen Brandon Holley River Viiperi Boo Boo Stewart Shanola Hampton Pia Toscano FABB FABB West Nash Overstreet Alan Bergman Sonos Studios Sharna Burgess Sonos Daphne Wayans Joe Roth Miguel Ferrer Tom Kuntz Tracy Anderson Flagship Studio Montage Bog Iger Laurene Powell Jobs Jared Diamond Gillian Wynn Peter Seligmann Conservation International's 17th Annual Los Angeles Dinner Dean Deacon Bugs Exhibition Bugs Opening Bugs Exhibition Opening FABB Opening Night Agnes Bruckner Kristina Anapau Cynthia McWilliams A Letter To My Dog: Notes To Our Best Friends Cocktail Party A Letter To My Dog: Notes To Our Best Friends Anthropologie Beverly Hills Jud Tylor Lindsay Arnold Jesse Heiman Playhouse Hollywood Hollywood Rocks Hollywood Rocks Party Star Magazine's Hollywood Rocks A Letter To My Dog Notes To Our Best Friends