Taylor Swift, Joel Crouse, Austin Mahone, and Ed Sheeran perform at Lincoln Financial Field in Philadelphia on July 20, 2013.
Listen to Taylor Swift on iHeartRadio
Photo: Rachel Kaplan for iHeartRadio
Listen to Austin Mahone on iHeartRadio
Listen to Ed Sheeran on iHeartRadio
iHeartRadio Live: Darius Rucker
30 Pics of Taylor Swift's Signature Stance
iHeartRadio LIVE: Carrie Underwood