Jennifer Lopez Talks iHeartRadio Festival, Teases 'Idol' Return on 'Today Show'

Jennifer Lopez made the "big announcement" that she will join a star-studded lineup at the iHeartRadio Music Festival -- but remained mum on whether or not she will return to "American Idol" -- during an appearance on "The Today Show" this morning.

Lopez will join Lady Gaga, Coldplay, Kenny Chesney, Carrie Underwood, the Black Eyed Peas and fellow "Idol" judge Steven Tyler, among others, at the two-day festival, which will take place on Sept. 23-24 at the MGM Grand in Las Vegas. "It's going to be this amazing concert... to launch the new iHeartRadio, where you can kind of customize your own radio stations," says Lopez. "So, it's pretty exciting. I'm glad to be doing it."

As for her return to "Idol," which she said "could go either way" last month, Lopez says that she had nothing to announce as of yet. "You know, I love working on 'American Idol,' love doing it," says Lopez. "I have no announcement to make as of this moment, but I promise, you guys will be the first (to know)."

Jennifer Lopez on 'American Idol': 'We Don't Know If I'll Be Back'

Clear Channel's iHeartRadio Music Festival will help launch an updated version of iHeartRadio, available this fall. Tickets for the fest will go on sale on Saturday (July 16).