Clear Channel announced the star-studded lineup for the 2014 iHeartRadio Music Festival Wednesday, and the impressive list includes music's biggest names such as Taylor Swift, Ariana Grande, Coldplay, One Direction, Lorde and Iggy Azalea.Taking place on September 19 and 20 in Las Vegas, the show will also feature surprise special guests and collaborations.Pics: Taylor Swift's Spottiest Styles Continue reading...Read more on NewsOK.com