Justin Timberlake's week-long residency on Late Night With Jimmy Fallon is just getting better and better. 

Following Monday's ceremonial quashing of his non-beef with Kanye, Tuesday brought a barbershop rendition of JT's hit "SexyBack," plus a performance of "Mirrors," another radio-ready track from his upcoming album The 20/20 Experience (stream it now!). 

Watch the barbershop bit above, "Mirrors" below, and check out his Kanye-slagging set last weekend on Saturday Night Live, too. Footage of JT's dress rehearsal of "Mirrors," featuring a cameo from Steve Martin, Chevy Chase and Bill Hader (standing in for Martin Short) as The Three Amigos, just dropped over at NBC.com