"Don't act like you forgot."

Joseph Gordon-Levitt lent his vocal cords to Jimmy Fallon's barbershop quartet the "Ragtime Gals" on Thursday.

The group treated viewers to a lovely, quaint rendition of Rihanna's "Bitch Better Have My Money." Gordon-Levitt's solo in the middle comes complete with a few dance moves so edgy Fallon had to reign him in.

The actor is promoting his new film, The Walk, about Philippe Petit's high-wire act between the Twin Towers.