Saturday, October 29, 2011 - Celebrities attend Kate Hudson's Halloween bash in Brentwood, CA. Seen here are Nicole Richie dressed as J-Lo with hubby Joel Madden; Chaz Bono and David Arquette arriving together; princess Gwen Stefani and friends, Jessica Alba as a witch with hubby Cash Warren, Zooey Deschanel in a retro costume, bunny Emma Roberts, and more!