"That's When I'll Stop Loving You" is a song by NSYNC from their 2000 album No Strings Attached, written by Diane Warren and produced by Guy Roche.
[1] Diane Warren wrote the track “That’s When I’ll Stop Loving You”, having previously penned “Music of My Heart" (1999) for the film of the same name, which was a collaboration between NSYNC and Gloria Estefan.
[5] Entertainment Weekly felt it was a rare occasion when NSYNC slipped into Backstreet Boys' ballad territory.
[6] The Baltimore Sun compared it to the work of Boyz II Men.
[7] Stereogum felt that on the track was outshined by another ballad on the album, I Thought She Knew.