We never thought we'd see the day!
*NSYNC's Lance Bass has shared a video to Tik Tok of himself teaching members of Backstreet Boys how to do the iconic 'Bye, Bye, Bye' dance.
The video, which has amassed well over 2 million views in just a day features Lance and fellow *NSYNC member Joey Fatone dancing alongside Backstreet Boys' Nick Carter and AJ McLean.
Lance, Joey, Nick, and AJ are actually part of a collab group called Back-Sync, which had a sold-out debut performance at the Grove in L.A. on Friday, June 18.
Watch their dance below!