Justin Bieber & Usher Rewind It Back With Their Believe Tour Duet!

While Justin Bieber’s Believe tour got off to a bit of a rocky start on Saturday night, it seems the pop star did rest up to get well enough for Sin City!
The Biebs took the stage at the MGM Grand in Las Vegas on Sunday night, with a special surprise guest — his mentor, Usher!
Check out their duet of Yeah (above)!!!
Aw! We bet Usher is SUPER proud of how far JB’s come since he saw that YouTube video back in the day!
We can’t wait for another Usher and Justin collaboration and wonder what OTHER surprise guests await!