Demi Lovato and Jimmy Fallon Headbang for Barney

Demi Lovato's purple past became her present Thursday night when she appeared on Late Night with Jimmy Fallon.

Taking a cue from both the 16-year-old starlet's early beginnings as a regular on Barney & Friends and her affinity for making YouTube clips with bestie (and fellow dinosaur show alum) Selena Gomez, Jimmy asked Demi if they could make a video of them belting out a metal version of the very mellow theme song to that popular kids' program.

Never have the lyrics "I Love You, You Love Me, We're a Happy Family" sounded so hard-core.

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Since Demi works for Disney, check out our Mickey Mouse Club gallery!

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