Lady Gaga, Nicki Minaj, David Guetta, Jennifer Lopez and may other stars set fire on stage with their performance during the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada.

The festival marks the official launch of iHeartRadio, Clear Channel's free digital radio product combining more than 800 broadcast radio and digital-only stations from 150 cities.

Check out the pictures below of the event..