No, they're not dating — seriously. But Zac Efron and Taylor Swift, who co-star in the animated Dr. Seuss movie The Lorax, would make a cute and talented couple, wouldn't they? Just check out the way they sing and play along to Foster the People's "Pumped Up Kicks" on The Ellen Show, improvising lyrics about how "weird" it is to face host Ellen DeGeneres' awkward line of questioning about whether or not they're an item.

Here's the video:

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