Watch Backstreet Boys and Jimmy Fallon hilariously sing 'Thong Song' as a barbershop quartet

We always knew the Backstreet Boys were talented … But now it seems they can make any song sound magical.

Joining Jimmy Fallon on The Tonight Show, Nick Carter, Kevin Richardson, Brian Littrell, AJ McLean and Howie Dorough busted out a hilarious ragtime version of the raunchy track Thong Song.

Harmonising perfectly with the late-night host, 'The Ragtime Gals' group turned Sisqo's 90s hit into a barbershop quartet styled song.

Amazing.

The Larger Than Life hitmakers cleared up some of the long-time rumours that about the band that have popped up over the years, including the ones about actor Ryan Gosling and fellow boyband, NSync.

Watch what they had to say below: