Fun joined iHeartRadio Music Festival 2013 lineup

The Queen will headline the iHeartRadio Music Festival, with special guests. Besides Adam Lambert on vocals, trio Fun will join the Brian May and Co.

According to reports from Billboard magazine, the musicians were seen rehearsing the song "Somebody to Love" and "Fat Bottomed Girls" on Tuesday (17). There is no information whether these songs will be performed by the group.

The two-day festival has already got started and the line-up will feature artists such as Katy Perry, Elton John, Keith Urban, J. Cole, Muse, Tiesto, Chris Brown and Benny Benassi, Paul McCartney, Justin Timberlake, Drake, Miley Cyrus and Tim McGraw and Bruno Mars.

The iHeartRadio Music Festival takes place at MGM Grand Arena in Las Vegas.