Friday, October 7, 2011 8:43am ET by  
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Justin Bieber and Selena Gomez duet in Brazil

Justin Bieber performed in Brazil on Thursday night, October 6, and brought a very special guest out to join him on stage for an exclusive live collaboration.

He played to a huge crowd in Rio de Janeiro and shocked everyone at the event when his girlfriend, Selena Gomez, walked out and sang a duet of her single 'Who Says' with him.

Bieber tweeted about the night after the concert and wrote:

"RIO!!! CRAZY!! thanks to @selenagomez for helping me do something special for the crowd. a duet never hurt nobody. WHO SAYS"

Watch the pair's collaboration here: