N'Sync fans, its been confirmed! They WILL perform at the VMA'S  on Sunday!

"They will reenact some of their greatest videos in a medley," one source says, singling out the smash hit "Bye Bye Bye," from their 2000 album No Strings Attached. "Then Justin will sing his new song 'Take Back the Night' and get his Michael Jackson award.

One source has said  that the group is still finalizing the setlist. Rehearsals are under way, though; all five guys got together in  New York City today to go over the performance

The MTV Video Music Awards air live on Sunday, Aug. 25, at 9 p.m.