Demi Lovato pretty much stole the entire show at the 2013 MuchMusic Video Awards on Sunday (June 16), performing her 2012 smash 'Give Your Heart a Break' and her latest hit single 'Heart Attack.' The songstress showed off her strong vocals and stage presence, interacting with her fans as she belted the "coronary" duo of choruses. 

Wearing a leather jacket with cage-like cutout sleeves, a black dress, and thigh-high boots, Lovato looked ultra cool and edgy as she wowed with her huge voice. While we love 'Give Your Heart a Break,' she really shined during 'Heart Attack,' since that song requires so much power, and Lovato sang it absolutely effortlessly.

The best part of her performance wasn't her killer outfit or vocals, though, it was how happy she looked to be there, especially when she went down into the crowd at the end. You can really tell how much her music and her fans mean to her.

Watch Demi Lovato Perform 'Heart Attack' at the 2013 MMVAs