Former Disney Channel star Demi Lovato has been enjoying the wild success of her latest summer anthem "Cool For The Summer" and in the midst of her first-day performance at Las Vegas' iHeartRadio Festival, the singer stormed the stage in a bodysuit to perform renditions of "Really Don't Care," "Heart Attack" and her latest single. Making the show a bit more unique, Lovato executed a duet with Third Eye Blind front man Stephan Jenkins on the band's 90s smash hit, "Jumper."

"Everybody give it up for the incredible Stephan Jenkins," she announced to the crowd before hugging the 90s icon.

While backstage, Lovato detailed the main focus behind her fifth studio album, Confident, due out October--empowerment. "I'm not afraid to have attitude on this album and just be able to say what I want, speak what I want -- that's really what I'm most proud of on this album is kind of not caring what anyone else thinks," she explained, Billboard. "Just making music for me."

The 23-year-old singer hopes her main mission will strongly impact her female listeners. "I always try to send kind of an inspirational music to everybody but I also really want to empower women," she said. "I think that with this album, hopefully it will empower women." Fans were particularly excited to find Lovato's boyfriend Wilmer Valderrama, ex-boyfriend Joe Jonas and long-time best friend Nick Jonas supporting their girl side by side in the crowd. The trio were caught jamming to Lovato's "Really Don't Care" in captured footage.

"Wilmer thinks she is extremely gorgeous and loves watching her perform and spending alone time together. He loves her voice and is her number one fan," a source told to E! News. "He was really proud to see her perform last night and they had a really nice time after together in Vegas."

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