Los Angeles: Pop star Lady Gaga's fetish for towering heels has costed her a tumble. The singer ended up with her legs in the air during a sold out concert while trying to perform a stunt.

The singer fell flat on her back as she jumped off her piano in the middle of a song, said reports.

Leaping off the burning piano onto the stool, her heel accidentally flicked the stool away from her and Gaga fell flat on her back under the piano.

Her outfit of bra and knickers offered no protection, but ever the professional Gaga didn't even miss a note of her hit “You And I”.

She carried on singing where she lay beneath the piano, having narrowly avoided smashing her head on the keyboard, then crawled to the feet, the microphone still clutched in her hand.

The fall came as Gaga performed as part of her Monster's Ball concert in Houston.

"She was really high up and it looked really bad. The crowd all saw it and I don't think anyone would have minded as she'd walked off the stage to get checked out by medics. But she was a real professional and jumped back up on stage to finish her set in front of the fans," said an onlooker.