Back in December, Taylor Swift revealed to Vogue that she wasn't dating anyone. It appears that may have changed, as Swift was spotted on a dinner date with Zac Efron recently. Did they pair find love on 'The Lorax' set?

Spies told Us Weekly that the pair arrived in Efron's Audi, then dined together at an Italian restaurant on Jan. 6. Sources described the pair as "in deep conversation" and calling Swift "very giggly." It was their second meal together at the same restaurant, Pace, in Los Angeles -- earlier that week, they broke bread with none other than Justin Bieber.

The pair go way back, with Efron describing Swift in December 2010 as "a lovely girl, very beautiful." No argument here! Swift returned the sentiments, calling Efron an "all-around amazing guy." A friend of the duo told Us, "They have been friends for a long time."

So are they something more? Not quite yet, the source revealed. "Taylor thinks Zac's cute," the snitch said, but added that "they are on totally different wavelengths."

We think this pairing would not only be absolutely adorable, but would serve as a PR dream for their upcoming Dr. Seuss animated flick, due in theaters March 2. C'mon, you crazy kids! Just kiss already!