Justin Timberlake, fun., Avril Lavigne, Miley Cyrus, The Summer Set To Play iHeartRadio Music Festival 2013

Justin Timberlake, Katy Perry, Elton John, Bruno Mars, Avril Lavigne, fun. and Miley Cyrus are among the few who have been confirmed to play this year's iHeartRadio Music Festival.

The two-day festival will be held on September 20 and 21 at Las Vegas' MGM Grand Arena.

Check out the lineup (as it currently stands) below.

Justin Timberlake
Katy Perry
Elton John
Muse
Tiësto
Chris Brown
Keith Urban
J. Cole
fun.
Bruno Mars
Phoenix
Zedd
Maroon 5
Miguel
Tim McGraw
Ke$ha
Thirty Seconds to Mars
Benny Benassi
Special live appearance by Queen and Adam Lambert
Other special surprise guests

iHeartRadio Music Festival Village (multiple stages)

Miley Cyrus
Avril Lavigne
AWOLNATION
Pete Tong
Twenty One Pilots
Jason Derulo