To promote their new animated movie 'The Lorax,' which lands in multiplexes next weekend, Taylor Swift and Zac Efron, who are not a couple, embarked on an Ellen DeGeneres-designed 'dance dare' at the film's Hollywood premiere. If you are not familiar with the concept of a dance dare, it's basically when you dance around people until they notice and/or catch you. Silly? Yes? Super fun? Definitely.

The duo danced around other famous people, like senior citizen fave Betty White, who lends her voice to the film, as well. Swift's best friend Selena Gomez and her boyfriend Justin Bieber are also a part of the dance dare fun.

For the dance dare, Swift and Efron got down and boogied to 'Sexy and I Know It' by synth pop group LMFAO. Swift, wearing an incredibly femme, cream-colored, sleeveless dress with an adorable neckline and heels, appeared to be enjoying herself. The whole dance dare "craze" reminds us of the old phrase "Dance like no one is watching."

It's hilarious to see Swift let loose and flail around in a goofy fashion. She got her groove on and was shaking her thing without a care in the world.

Watch Taylor Swift + Zac Efron 'Dance Dare'

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