Who Says is a song performed by American band, Selena Gomez & The Scene.
Selena Gomez & The Scene + Taylor Swift
At a Taylor Swift concert, Taylor introduces Selena to the stage as her BFF. They have a reunion hug and then they sing, in duet form, Selena Gomez & The Scene's song, Who Says from the album 'When The Sun Goes Down'.
Click link to see the Tay and Sel version: http://youtu.be/DfrI_OD3j3U