We're not sure WHY these people are famous, but we are definitely here for the drama!
Allow us to give you a play-by-play...
See the ego blows (below)!
[Image via Instagram.]
Taylor Swift isn't the only musical sensation with famous friends!
Justin Bieber is in the middle of his Purpose tour, and the pop star invited a special guest to join him on stage during his Atlanta, Georgia concert!
During Wednesday night's show, the Sorry singer began playing an acoustic cover of Usher's 2001 hit U Got It Bad — when the R&B star came on stage himself and turned the cover into an epic duet!
The Biebs and his mentor surprised the audience by performing a number of Usher's hits — including I Don't Mind and U Don't Have To Call!
Awwww! So much love!
Watch the clips of the music icons performing together (below) to see the crowd go wild!
[Image via YouTube.]