Get ready for a big night of performances at the 2017 iHeartRadio Music Awards! The Chainsmokers and Coldplay will play their first live performance of “Something Just Like This." Other performers taking the stage include Katy Perry, Ed Sheeran, Shawn Mendes, Thomas Rhett, Noah Cyrus (featuring Labrinth) and Big Sean. Leading the list of star-studded presenters will be Miley Cyrus, along with Demi Lovato, John Legend, Joe Jonas, Jason Derulo, DJ Khaled and many others. The iHeartRadio Music Awards, hosted by Ryan Seacrest, will air live this Sunday on TBS, TNT and truTV at 8 p.m. EST.