One Direction performs at the 2014 iHeartRadio Music Festival on Sept. 20, 2014.

On September 20, 2014 the boys performed at the iHeartRadio Music Festival in Vegas.
the iHeartRadio Music Festival rocked, with performances from some of the biggest acts in music, such as Ed sheeran, Paramore, Ariana Grande and ofcourse One Direction!


Video of the boys performing:

Pictures of the boys at the festival: