Lovato, 22, brought along her boyfriend, Wilmer Valderrama, 34, for support. Backstage, the couple posed for pics with Blink-182's Travis Barker -- a longtime friend and collaborator of the pop star -- and his kids.
Just before taking the stage, the "Heart Attack" songstress opened up about her relationship with Wilmer to ET Correspondent Lance Bass. "Wilmer is one of the most incredible people on the planet," she gushed.
#TBT to that one time we had an hour to kill before our movie so we went to the furniture store and took a nap..... 😴😊😝💗 missing you.
The former Disney starlet also revealed that Wilmer is a major reason why she is still friends with her ex-beau, Joe Jonas. Lovato and Jonas first Camp Rock in 2007 and very publicly ended their roller-coaster romance in 2010.
In fact, Wilmer is the one who suggested that Demi and Joe reunite for a Camp Rock reunion duet at her show in Los Angeles last month.
Demi also showed-off her edgy new hairstyle during her VEVO performance, a bob-style cut with one shaved side and teal-blue ends. She confirmed to ET that her new punk-rock 'do was surprisingly made on a whim, explaining she made the drastic choice "impulsively the night before."
"I tell my assistant, 'Fly out my hair dresser, like, when can she come out? Tomorrow morning, great, where are we, we're going to be in Texas, great.'"
#SelfieSunday #newhair #supCalgary? #demiworldtour 💋💋💋💀💀💀
We want to know! Are you a fan of "Dilmer" or not? Share all your thoughts on Demi and Wilmer in the comment section below or chat with @Katie_Krause on Twitter and include that hashtag #ETNow!