Demi Lovato made Lovatics and 'Jimmy Kimmel Live!' viewers go into cardiac arrest with her performance of her new electro-pop single 'Heart Attack' on the late night show last night (April 1).

Lovato performed outside, dressed in an asymmetrical black skirt with a print blazer and much shorter hair than she's rocked as of late.

Lovato was all about hitting the high notes in the song's bridge. That was certainly a way to let us know that 'Demi' drops on May 14.

Her leg is all better, too. No more boot and crutches. Just a lot of dancing and sass.