Listen To Demi Lovato's 'Heart Attack'

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Photo: Splash News
She's been teasing the song debut for days, and last night, Ryan Seacrest unexpectedly debuted Demi Lovato's Heart Attack on his official website!
"I think the image of the video, I'm taking on a different look this time around," Lovato told MTV News. "I feel like I have my own thing going, like rocker-chic sophisticated, just a different kind of fashion style this time around."
Listen and ... love?