Backstreet Boys Go Back In Time for Hilarious Cover of 'Thong Song' on 'Fallon': Watch

Backstreet Boys and Jimmy Fallon
Andrew Lipovsky/NBC

Backstreet Boys and Jimmy Fallon photographed during "Ragtime Gals sing 'Thong Song'" on The Tonight Show Starring Jimmy Fallon on Feb. 11, 2020.

Backstreet’s back, alright. But this time, they’re looking particularly dapper. 

The good chaps from Backstreet Boys were guests Tuesday night (Feb. 11) on The Tonight Show Starring Jimmy Fallon, where they donned their most splendid threads for a singalong. 

Dressed to the nines as a barbershop quintet, the Boys, err, Ragtime Gals sang Sisqo's "Thong Song" with support from Fallon.  They also dropped onto the couch to recall the first time they ever harmonized together (Apr. 20, 1993) and the song they blended their voices on, Shai's "If I Ever Fall in Love."   

It's a fetching look in stripes and boater hats, and their a cappella version hits all the right notes. Earlier this week, the heavyweight boy band announced a second North American leg of their  DNA World Tour.

Watch their late-night appearance below.