We all know about the East Coast/West Coast boy band rivalry of the ’90s, which ended tragically with the cancellation of ‘House Of Carters’.

Well it would appear the beef has now been squashed as NSYNC’s Lance Bass joined the Backstreet Boys onstage in Las Vegas to collaborate on the 2000 Black and Blue ballad ‘Shape Of My Heart’.

We reached out to members of O-Town and 5ive for comment, and are yet to hear back.

Check out footage of the unholy alliance below.