Grande's latest single has become a huge hit.
Halsey,The Killers and Chance the Rapper are also among those taking the stage at the three-day festival in Watkins Glen, New York.
The Backstreet Boy opened up about his hurdle-filled road to adulthood and how becoming a father made him finally "grow up."
The legendary musician died on Saturday.
Pratt enthused that he's also ready for "the upcoming stadium tour."
The 49-year-old singer also talked about supporting Cure 4 the Kids Foundation with donations from her Planet Hollywood show.
ET was on set for an exclusive sneak peek at the Backstreet Boy's wedding in his new 'Boy and a Man' video.
AJ McLean ties the knot with his real-life wife, Rochelle, again in the emotional new video for his new single, 'Boy and a Man.'
Vanessa Vanjie Mateo shares on-set secrets from the video shoot!
ET caught up with Katy Perry, Kacey Musgraves and more celebrities at the 2019 iHeart Music Awards.
ET opens its vault to revisit Nick, Joe and Kevin's early interviews, tracking their rise to superstardom.
ET talked to the group about the new 'Boy Band Con' documentary, which centers on their early manager, late mogul Lou Pearlman.
ET chatted with the singer on the red carpet at the iHeart Radio Awards Thursday.
ET's Lauren Zima spoke with singer Tiffany Young at the iHeartRadio Music Awards on Thurs., March 14.
