The cast of MBC's 'I Live Alone' held a Christmas party on the December 22 episode.

Super Junior-M's Henry, Jun Hyun Moo, Park Na Rae, Han Hye Jin, Lee Si Un, and Gian84 got all dressed up in crazy costumes for the festivities, and Henry and Jun Hyun Moo teamed up for a duet to "Uptown Funk", originally by Mark Ronson & Bruno Mars.

How do you think they did with their harmony? Check out some of the other cast members' karaoke fun below.