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Courtesy of Key Club

Despite what it looks like, Pink is not dating musician Todd Morse.

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."

Reports first surfaced that Pink and Morse may have been more than just friends after they were spotted together at the Key Club in March. A month later, paparazzi captured them frolicking together on a beach in Malibu.

However, a rep for Pink says they are just friends: "They are not a couple. Todd has a girlfriend who was there at the show cheering them on."

 —Additional reporting by Claudia Rosenbaum