WATCH: Usher, Ludacris & Lil Jon Perform at So So Def 20th Anniversary Concert

Usher, Ludacris and Lil Jon were never signed to Jermaine Dupri's So So Def Recordings, but they turned out to show some love for their pal and the Atlanta label's 20th Anniversary. But when it comes to Usher, Dupri has produced a slew of hit singles for the singer. Usher came out to perform his medley of Dupri-produced tracks at the So So Def 20th Anniversary concert last night, and was later joined by Luda and Lil Jon for “Lovers & Friends” and “Yeah." Watch the crowd singalong spot-on with the crew below.

[via Rap Radar]