For this current tour Kris is taking daily song requests on Twitter/Facebook and every show has a new cover song learned that day. I did request a *NSYNC medley from him at one point so I guess this is close enough? lol
Even as a Kris fan I'm a bit impressed by just how good this cover is. Love the lower register during the Timberland section (and the crowd taking over Justin's part because I love me some audience participation) and that falsetto at the end is so good!