Molly Sims, Kelly Osbourne, and Portia de Rossi celebrate with Stella McCartney at the Fourth Annual Autumn Party; Jane Fonda, Natasha Bedingfield, and Diane Lane step out for the Oceana Partners Award Gala; Rebecca Romijn, Alicia Silverstone, and Jerry O'Connell premiere Ass Backwards at The Vista; Ahna O'Reilly, Michelle Trachtenberg, Hannah Bronfman, and more dance at the cemetery for UNICEF's 1st Annual Masquerade Ball; Jessica Alba, Rashida Jones, and Brad Goreski party with Kenzo for the release of "Kalifornia"—read up on Wednesday's top events in this edition of Last Night's Parties.