Credit: GV Cruz/WireImage

Nick Jonas may be Demi Lovato’s biggest fan.

Jonas opened for Lovato at Avalon Hollywood on Friday as part of Time Warner Cable and Lifebeat’s MTV Video Music Awards show, but after he finished his set, he stuck around backstage, where he dramatically rocked out to Lovato’s version of “Let It Go.” Luckily, his brother — and Lovato’s ex-boyfriend — Joe captured the entire thing and shared it on Snapchat.

Lovato will perform Sunday during the VMAs, and Jonas will perform as part of the pre-show. Jonas’ song “Chains” is also nominated for best male video.

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