OMG! Justin Bieber and Selena Gomez sing "Who Says" together!

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Hey M Girls!

Last night at Justin Bieber's tour stop in Rio de Janeiro, he brought out a very special guest to sing: GF Selena Gomez. Check out the video of their duet:

Justin also tweeted after the performance thanking Sel:

Aww, so sweet!

Let's dish: -What do you think of their duet?

Comment back!

Photo: Startraks

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