Taylor Swift and Zac Efron didn't just dispel dating rumors and sing a duet for their appearance on 'The Ellen Degeneres Show' this past week. The duo, who are co-stars in the upcoming Dr. Seuss film 'The Lorax' actually brought raw footage of their "dance dares" from the film's premiere.

Now, we're not exactly 100% sure what Ellen's "dance dares" entail, but from the looks of things, it finds people partaking in secret dance parties behind another person's back until they're noticed. At 'The Lorax' premiere, Swift, decked out in high heels and a designer dress, stomped along to 'Sexy and I Know It' along with Zac Efron behind a slew of famous faces.

In the beginning, Swift and Efron get down behind Betty White, whose voice is also featured in 'The Lorax.' Next up on their list of innocent victims was the unsuspecting Selena Gomez, who was so deep in conversation that she hardly noticed her songbird BFF and the actor breaking it down behind her. Gomez's boyfriend Justin Bieber also got a taste of Taylor's sweet moves while in the studio, as did 'Dangerous' hitmaker Akon.

What do you think of Swift and Efron's moves? Check 'em out below!

Watch Taylor Swift + Zac Efron Partake in Some 'Dance Dares'