Swift, Efron prank celebs with sneak-attack dance moves

Zac Efron and Taylor Swift may not be a couple, but that doesn't mean they don't like to shake loose and dance together. The two stopped by the "Ellen DeGeneres Show" earlier this week to promote their new flick, "The Lorax," and showed off how they use their dance skills to have a good time with their unsuspecting celeb friends. The two played a video of themselves pranking other stars by simply going up behind them and busting moves in random situations. Betty White, Selena Gomez and Justin Bieber were a few of the celebs who fell victim to this stunt and, while Zac definitely knows how to shake it, Taylor could use a lesson or two.

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