Listen to Britney Spears on iHeartRadio

The 2013 iHeartRadio Music Festival keeps getting BIGGER!

It has been confirmed that the one and only Britney Spears will be in the house for the 2013 iHeartRadio Music Festival! She'll make a special appearance on the stage at the MGM Grand Saturday night as a presenter.

Yes, for those of you following along at home, that is the same night that Justin Timberlake will perform!

The iHeartRadio Music Festival goes down September 20th and 21st at the MGM Grand Garden Arena in Las Vegas. Tickets are sold out, but in celebration of her new song,  Britney is giving fans a chance to score last-minute tickets. CLICK HERE for deets on how you can enter to win a trip to be in Vegas for the epic event!

Listen to 2013 iHeartRadio Music Festival Radio

This weekend, Britney released her brand new song, "Work B**ch." Listen to the song below.

The iHeartRadio Music Festival lineup features the biggest artists in all genres of music: Justin Timberlake, Paul McCartney, Katy Perry, Drake, Elton John, Muse, Tiësto, Chris Brown, Keith Urban, fun., J.Cole, Miguel, Bruno Mars, Phoenix, Zedd, Maroon 5, Tim McGraw, Ke$ha, Thirty Seconds to Mars, Benny Benassi, plus a rare live appearance by Queen + Adam Lambert and other special surprise guests.

In addition to the nighttime shows, this year will mark the first-ever iHeartRadio Music Festival Village taking place Saturday afternoon, September 21st on the Las Vegas Strip at The Lot across from Luxor. The Festival Village will feature live performances on two stages by nearly a dozen popular and up-and-coming artists, including Miley Cyrus, The Wanted, Jason Derulo, The Band Perry, Avril Lavigne, Krewella, Cher Lloyd, twenty one pilots, Pete Tong, AWOLNATION and a special guest appearance by Ne-Yo.