Justin Bieber thrilled fans in Brazil on Thursday night (06Oct11) by bringing his girlfriend Selena Gomez on stage for a duet at his show in Rio de Janeiro.
The teenage pop star is currently touring South America and Gomez joined him during his stop in Brazil for some sightseeing.
They took a helicopter ride together in Rio on Tuesday (04Oct11) and on Thursday, Gomez joined him onstage during his show at the Estadio do Engenhao.
The couple sang a duet of Gomez's hit track Who Says, and after the show, Bieber thanked his girlfriend for her efforts in a post on his Twitter.com page.
He wrote, "Rio!!! Crazy!! Thanks to Selena Gomez for helping me do something special for the crowd. A duet never hurt nobody. Who Says."

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