Fun. had a whole mess of fun at the 2013 Grammy Nominations Live concert in Nashville tonight (Dec. 5.) The band performed its smash hit 'We Are Young' and petite powerhouse Janelle Monae was on hand to deliver her vocal parts, which was a welcome surprise. Monae is a crucial part of the song, so it was only fitting that she was there to join the boys onstage.

The band turned in a rich, orchestral, lush and expansive rendition of the song, complete with strings. Monae looked adorbs in her black fedora and vest, while fun. frontman Nate Ruess cut a dashing figure in a suit. They certainly showed up in celebratory attire.

And guess what? Fun. had many reasons to celebrate tonight, besides the fact that they were performing on a national stage such as this.

The group proved to be a favorite of the Grammys, and it racked up multiple nominations, including Best Pop Vocal Album for 'Some Nights'; Record of the Year for 'We Are Young'; and Best New Artist. Not bad, not bad at all for the boys.

Congrats to fun. on grabbing six nominations! We wish them the best as Grammy season draws nearer.