Featuring performances from Rihanna, Sam Smith, Madonna, Jason Aldean & more
Tune in this Sunday at 8/7c on NBC to see who wins!
See exclusive videos from Kelly's iHeartRadio Album Release Party
Watch as iHeartRadio's Paul Costabile crashes the set!
NATURE: Watch as this baby CLAPS ALONG with a song mom sings in the ultrasound!
Fan Literally Thrown OFF-STAGE!!
Put Out Fires With NOISE!!??
WATCH: Kid Steals The Show Dancing To 'Happy' At High School Basketball Game
21 Roast-Worthy Bieber Moments