Taylor Swift and Zac Efron Perform Duet on 'Ellen' (Video)
The 22-year-old country singer explained that she had given her co-star a guitar lesson, and complimented him by saying he was "really good at it." Then Tay and Zac broke out into a rendition of Foster the People's mega hit, only with new lyrics, which poked fun at Ellen.
They sang: "Every single time I come on this show / It's really weird, really weird / All because of Ellen!" Too cute!
But while Taylor and Zac do have chemistry, it ends on the friend level. "We are not a couple," the singer confirmed. "He's awesome -- we are not a couple, though. You hear people get together when they're shooting movies, co-stars. But not like animated co-stars. You know what I'm saying."
"Oh my god," she added mockingly. "As we were recording out voiceovers on separate coasts we really connected."
Check out the stars' duet below and let us know what you think of it in the comments. 'The Lorax' opens in theaters on March 2.