Tonight is the iHeartRadio Festival on The CW Network [VIDEO]

Although the festival went down a couple of months ago in September,  the 2013 iHeartRadio Music Festival took over the MGM Grand Garden Arena in Las Vegas and of course cameras were rolling.

This year's lineup features the biggest artists in all genres of music including Justin Timberlake, Katy Perry, J.Cole, Elton John, Muse, Tiësto, Chris Brown, Keith Urban, fun., 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.

There was so much action on that epic night in Vegas that it is going to take two nights to bring you all the action. The iHeartRadio Music Festival will be televised as a two-night primetime special on The CW Network on Monday, Dec. 30 at 7-9 p.m. and Tuesday, Dec. 31 at 7-9 p.m.