Just Dance star's bra lights up the stage

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Lady GaGa wowed fans when fireworks shot out from her boobs on stage.

The singer was performing at the Much Music Video Awards in Toronto, Canada, when the sparks started to fly. 

Lady GaGa, who was also wearing studded gloves and spiked boots, had her outfit customised so she could set her conical bra alight. 

She later picked up the gong for Best International Hit for Poker Face

Lady GaGa, 23, real name Stefani Germanotta, is dating a businessman known only as Speedy.

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