Demi Lovato [1] kicked off the iHeartRadio Music Festival [2] in Las Vegas, keeping up her cool-girl vibe among artists like Kanye West [3], Sam Smith, and BFF Nick Jonas [4]. The singer first rocked the MGM Grand Garden Arena in a preshow interview with Z100's Elvis Duran. She wore an edgy minidress and supertrendy hair (she's single-handedly bringing the '90s back, you guys, and it's the best!) and took her look to the next level when she hit the stage in a sexy bodysuit and a cropped fur jacket.

During her energetic performance, Demi perform her new single, "Confident," live for the first time, plus everyone's Summer jam "Cool For the Summer" [5], even paying homage to the '90s (again!) with a special performance of "Jumper" by Third Eye Blind alongside the band's lead singer Stephen Jenkins.

As for Demi's longtime love Wilmer Valderrama [6] and new puppy Batman? They were there, too! Demi even joked about wanting to be called "Batmom [7]." Keep scrolling to see pictures of Demi's stunning looks and her cute moments with Wilmer and Batman, then take a look at photos that will make you fall in love with Batman [8].