Justin Bieber is in Brazil and he brought his girlfriend Selena Gomez along with him. After their romantic rendezvous in a helicopter ride in Rio and staying in a $2,900 per night penthouse suite, the famous young singer surprises his fans in Brazil when he duets with his girlfriend Selena Gomez in "Who Says."

The audience was given a surprise when Justin called out his special guest who was his ladylove, Selena to share the stage with him. Both did a duet of Selena's single and ended the performance with a hug and a kiss.

"RIO!!! CRAZY!! thanks to @selenagomez for helping me do something special for the crowd. a duet never hurt nobody," Justin tweeted after his concert.

Justin gave his South American fans another surprise by singing "Mistletoe, his first single in his holiday album "Under the Mistletoe."

"This is the first time anywhere in the world that I've sang this," Justin tells his screaming fans. "So this is special. This is just for you."

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