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Watch Katy Perry's sweet duet with girl who has autism

It's Katy Perry's sweetest duet yet: The pop star and New York tween Jodi DiPiazza, who has autism, teamed up for a rendition of "Firework" on stage at Comedy Central's "Night of Too Many Stars" autism benefit. Watch the video to see the two totally rock it out.

The piano prodigy was diagnosed before her second birthday, her parents told the celeb-packed crowd in the video. The special airs Sunday, Oct. 21, on the network.

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