Rob Lowe, Michelle Trachtenberg, and the cast of Killing Kennedy hit the L.A. film premiere at the Saban Theatre; despite Chris Hemsworth and Liam Hemsworth's presence, Jaimie Alexander's shockingly revealing dress steals the show at the premiere of Thor: The Dark World; Kristen Bell hosts the Gorilla Doctors of Africa benefit with Sharon Stone and Dax Shepard; Zac Efron helps honor Michael B. Jordan with Vanity Fair—catch up on Monday's top events in this edition of Last Night's Parties.

The Guest List

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Soho House• Janice Dickinson• Michelle Trachtenberg• Mario Lopez• Karina Smirnoff• Sharon Stone• Jane Fonda• Zac Efron• Gloria Steinem• Lisa Rinna• Diane Warren• Equality Now• Ricki Lake• Kristen Bell• Kelly Rowland• Maria Menounos• Aisha Tyler• Shannon Elizabeth• Julie Chen• Debby Ryan• Maria Bello• Nelson McCormick• Forest Whitaker• Kat Dennings• Maria Shriver• Gloria Allred• Jeremy Renner• Simon Cowell• Dax Shepard• Ron Jeremy• Niecy Nash• Jada Pinkett Smith• Sharon Osbourne• Liam Hemsworth• RJ Mitte• Demi Lovato• Tia Mowry• Tamera Mowry• Allison Janney• Kiernan Shipka• SLS Hotel• Beau Bridges• Jason Ritter• Zachary Levi• Rob Lowe• Ace Gallery• Paul Reiser• Chris Hemsworth• X Factor• Courtney Mazza• Colbie Caillat• Octavia Spencer• Bob Iger• Rachel Boston• Holland Roden• Robert Knepper• Anna Faris• Jaimie Alexander• Kevin Feige• Neal McDonough• Eric Christian Olsen• A.J. Cook• Katherine Schwarzenegger• Nadine Velazquez• Michael B. Jordan• Bailee Madison• Clark Gregg• Nikki Deloach• Bianca Lawson• Sarah Chalke• Michelle Stafford• Sara Gilbert• Anthony Hopkins• Thor The Dark World• Nathan Fillion• Candace Cameron Bure• Bill Paxton• Daniela Ruah• Alyson Hannigan• Alexis Denisof• Montage Hotel• Tom Hiddleston• Madchen Amick• Adewale Akinnuoye-Agbaje• Saban Theatre• Paulina Rubio• Joss Whedon• Chris Hardwick• Derek Theler• Brett Davern• Brian Tyler• Jillian Rose Reed• Sheryl Underwood• Molly Tarlov• Ming Na• Ray Stevenson• Lily Tomlin• David Marciano• Bellamy Young