Justin Timberlake performs during the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas on Saturday. (Christopher Polk / Getty Images)
Zedd performs Saturday at iHeartRadio Music Festival on Day 2 in Las Vegas. (Powers Imagery / Invision / Associated Press)
Thirty Seconds to Mars performs at iHeartRadio Music Festival (Powers Imagery / Invision / Associated Press)
Tim McGraw croons on at iHeartRadio Music Festival. (Powers Imagery / Invision / Associated Press)
Miguel performs at iHeartRadio Music Festival. (Powers Imagery / Invision / Associated Press)
Maroon 5 thrills the crowd at the iHeartRadio Festival. (Powers Imagery / Invision / Associated Press)
Kesha takes the stage in a shiny black bathing suit for her set at the iHeartRadio Music Festival. (Powers Imagery / Invision / Associated Press)
Britney Spears introduces Miley Cyrus at the iHeartRadio Music Festival (Powers Imagery / Invision / Associated Press)
Miley Cyrus, brandishing a banana-styled microphone, performs at the iHeartRadio Music Festival. (Powers Imagery / Invision / Associated Press)
