Jeff Vespa/Wireimage
September 26, 2011 10:00 AM

Joel Madden led guests in a rousing rendition of “Happy Birthday” while celebrating Nicole Richie‘s 30th birthday at the Four Seasons Beverly Wilshire in Beverly Hills along with celeb pals such as Mary-Kate and Ashley Olsen and Samantha Ronson. The birthday gal got a Samsung Galaxy S II, which she used to snap pictures all night. After enjoying some cake, the bash turned into an all-out dance party, during which Ronson took the mic and challenged people to a dance-off.

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