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Courtesy of Key Club

It looks—and sounds—like Pink and her musician boyfriend Todd Morse are still going strong.

The rocker was a surprise guest last night at L.A.'s Key Club, where Morse and his Tom Petty and Johnny Cash tribute band, Petty Cash, were doing their weekly Monday night gig in the Plush Lounge.

And Pink wasn't just in the audience...

"She jumped onstage and belted out 'Free Fallin' ' [a Petty classic]," an eyewitness reports. "It was really packed and everyone was dancing."

This duet's been months in the making. Reports first surfaced that Pink and Morse were more than just friends after being spotted together at the Key Club in March. A month later, paparazzi captured them frolicking together on a beach in Malibu.

—Additional reporting by Claudia Rosenbaum