Justin Timberlake capped the second night of a week-long residence on Late Night With Jimmy Fallon with a performance of "Mirrors." Timberlake is in town promoting The 20/20 Experience - his first release in six years on RCA. The night also included a barbershop quartet re-work of Timberlake's "Sexy Back" for a group performance of the song featuring host Jimmy Fallon and his Ragtime Gals. As if that weren't enough, JT is reportedly set to premiere a new music video on the show this week. Peep his performances below. Stay tuned for more.