Usher Joins Justin Bieber on Stage For a Sweet Acoustic Duet

Justin Bieber was joined on stage by his longtime friend and mentor, Usher, during his Purpose tour stop in Atlanta on Wednesday. Soon after Bieber started singing an acoustic cover of "U Got It Bad," Usher stepped on stage to surprise the crowd. (Flashback to the time a young Bieber performed the song for Usher, which you can watch below!) The pair performed other Usher hits, too, including "I Don't Mind" and "U Don't Have to Call," and Bieber later tweeted that the night's show was one of the "best yet." Check out their acoustic duet above plus a throwback Bieber moment below, and then watch his recent iHeartRadio performance.