But You Never Come

Taylor Swift and Zac Efron participated in a prank facilitated by Ellen DeGeneres prior to their appearance on The Ellen Show which aired today, February 21.

Zac and Taylor went up behind unsuspecting friends at the premiere of their flick The Lorax and danced. The pair danced behind/on Betty White, Selena Gomez and Justin Bieber.

Such a cute vid! Betty is so cute!