Watching fun. perform is always, well, fun because they always seem so in awe of their own success. Frontman Nate Ruess delivered a killer show on Dec. 7 at Jingle Ball, including a stellar performance of 'We Are Young,' and appeared amazed to just be on the Madison Square Garden stage.

Like fellow performer Jason Mraz, the band led a singalong to their signature song, with Ruess commanding, "Let me see your cell phones!" Janelle Monae didn't join fun. onstage this time, but the audience did so well singing the bridge that we don't think anyone minded.