Katy Perry was the headliner on the first day on the 2013 iHeartRadio Music Festival at the MGM Grand in Las Vegas on Friday, September 20. The singer performed “Roar” and “Dark Horse” featuring Juicy J off of her forthcoming fourth studio album titled Prism.
Prism will be released on October 22nd. You can pre-order it now on iTunes. https://itunes.apple.com/us/album/prism-deluxe-version/id690928033.