Justin Bieber and Selena Gomez Sing 'Who Says' In Brazil!

Selena Gomez made a surprise appearance last night at Justin Bieber's concert in Rio de Janeiro!

Hollywood's cutest couple was spotted touring the city during the day before performing the hit song, 'Who Says,' at the Biebz's concert later in the night.

We wonder if Justin will surprise Selena with any cute dates while they are on their South American adventure!

Check out the performance below and tell us what you think about the dazzling duo!