Amy Winehouse  surprised fans attending Mark Ronson 's gig at London's 100 Club on Tuesday night (July 6), joining the producer onstage to perform a song. Wearing a low-cut black leotard that revealed a lacy white bra, the troubled singer took the stage with Ronson -- who produced her Grammy-winning 2006 album "Back to Black" -- to sing "Valerie," from his own album, "Version."
Video: Amy Winehouse & Mark Ronson in London
While it wasn't exactly a stellar performance, it did give fans some hope that Winehouse is finally ready to head back into the studio, after years of struggling with addiction and running afoul the law. Unfortunately, Ronson squashed that optimism shortly after his show, telling the U.K.'s Daily Mail  that Winehouse still hasn't started recording her follow-up to "Back to Black." "Amy hasn't begun working on her next record yet," he said. "When she's got ten songs we'll go down to the studio together."
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