Kelly Clarkson & Lady Gaga: iHeartRadio Music Festival Lineup Announced!

The iHeartRadio Music Festival lineup has been announced!

Ryan Seacrest will host the two-day music event, which will mark the biggest live concert festival in radio history.

Confirmed for the event, taking place Sept. 23 and 24 at the MGM Grand in Las Vegas: Lady Gaga, Coldplay, Alicia Keys, Steven Tyler, The Black Eyed Peas, Kenny Chesney, Jennifer Lopez, Carrie Underwood, Jane’s Addiction, Nicki Minaj, John Mayer, David Guetta, Rascal Flatts, Bruno Mars, Kelly Clarkson, Sublime with Rome and special performances from Usher and Sting!

For info on how to purchase tickets, check out iHeartRadio’s Facebook page. If you can’t attend, live audio and video streams will be available online, via mobile devices at www.iHeartRadio.com and across all of Clear Channel’s radio station websites.

Check out J. Lo making the announcement on the Today show!