5. JOAN RIVERS

When:  January 2012
Comment: "Joan Rivers gets up and she's like, 'I'd like to thank Chelsea Handler for giving me a career in comedy, and congratulations on your stage, Chelsea, because I don't even have a dressing room.' And I'm like, fuck off!"

During her most recent appearance on Howard Stern's radio show, Chelsea added fuel to her fight with Joan Rivers, who publicly called her a "whore."