Matthew Morrison and JC Chasez Perform ‘N Sync Hit ‘This I Promise You’ (VIDEO)

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First it was the New Kids on the Block and now it’s ‘N Sync! Looks like Matthew Morrison is an honorary boy band member. The Glee guy showed up onstage with ‘N Sync alum JC Chasez for a special performance of the group’s hit ballad “This I Promise You.” 

The two performed Monday night at New York City’s Beacon Theater as part of the event Back on Broadway One Night Only. Though Matthew started on Broadway, he’s moved on to other performance ventures. 

In addition to his part on Glee, the actor has also been confirmed to hit the big screen with Jennifer Lopez and Cameron Diaz. Matthew will star in the book-turned-movie What to Expect When You’re Expecting. What do you think of JC and Matthew’s performance of “This I Promise You”? Is it better than the original? Check out ‘N Sync’s version below and sound off in the comments!