Frontman of Grammy Award-winning group fun., Nate Ruess made a guest appearance on a Las Vegas stage last night with rock legends Queen and their current frontman Adam Lambert.

The appearance was rumoured ahead of the iHeart Radio Festival gig as Ruess was spotted at rehearsals for the band, and on the day of the performance Lambert’s rep refused to deny the whispers. On the night, Ruess hit the stage to duet with Lambert on Queen classic ‘Fat Bottomed Girls’.

fun. were due to perform at the festival as well, alongside a host of other top artists including Elton John, Justin Timberlake, Paul McCartney, Bruno Mars and Muse.

Check out some videos from the performance below, including fan footage of Ruess joining the band: