This year's iHeartRadio Music Festival already has a mammoth lineup as it is, but the Las Vegas event also guarantees some surprises.

Queen and fun., both already slated to perform separately, will apparently collide, as Billboard reports that the latter's frontman Nate Ruess will be performing with the acclaimed British group, which is performing Friday night with guest lead singer Adam Lambert.

The band and Ruess were reported to have rehearsed together on Tuesday night, although details are unclear.

As we previously reported, performers of the two-day event, which runs Friday and Saturday, include Paul McCartney, Justin Timberlake, Drake, Robin Thicke, Phoenix, Bruno Mars, J. Cole, Katy Perry, Elton John, Keith Urban, Muse, Tiesto, Chris Brown, Miguel, Maroon 5, Miley Cyrus, Tim McGraw, Benny Benassi, Zedd, Ke$ha, Thirty Seconds to Mars and others.

There will additional performances by Avril Lavigne, AWOLNATION, Twenty One Pilots and Jason Derulo.

Stay tuned as we'll have live broadcast information for those who cannot attend.