Country Stars Kick Back at the iHeartRadio Festival

Nashville's stars can be serious, too! See Carrie Underwood, Luke Bryan and more singers' photo booth shots from the inaugural country fest

FLORIDA GEORGIA LINE

They're ready to "Cruise"! After collaborating with Jason Aldean on stage for a special rendition of "The Only Way I Know," Brian Kelley and Tyler Hubbard looked more confident than ever.