The 10-year-old girl whose rendition of Lady Gaga's "Born This Way" made her a YouTube sensation joined her idol onstage Thursday night - and stole the show.

Maria Aragon of Winnipeg, Canada, walked onstage to wild cheers from the concert audience at Toronto's Air Canada Centre. Gaga picked her up in a hug and spun her around in the air.

Maria, wearing shiny black tights, a pink top and a tiny leather jacket, then sat on Gaga's lap on the piano bench and poised her fingers over the keyboard.

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