WATCH: Backstreet Boys Sing Barbershop Cover of ‘Thong Song’ with Jimmy Fallon

WATCH: Backstreet Boys Sing Barbershop Cover of ‘Thong Song’ with Jimmy Fallon

The Backstreet Boys stopped by The Tonight Show Tuesday night (February 11th) where they travelled back in time to cover Sisqo’s “Thong Song” with Jimmy Fallon.

Watch the boys performed as a barbershop quintet below.