Pink stunned music fans at Los Angeles nightspot the Key Club on Monday night when she took to the stage to belt out a cover of Tom Petty's Free Fallin' with the house tribute band.

The hitmaker joined pal Todd Morse, who fronts covers act Petty Cash, for a special performance.

The appearance fuels reports that Pink is dating the musician, but insiders insist they're just friends.

One source says, "Todd has a girlfriend who was at the show cheering them on."