Taylor Swift and Zac Efron are not dating, even though they both lend their voices to the new Dr. Seuss film, The Lorax. But they have been spending quality time doing something very romantic: Taylor taught Zac how to play guitar!OK! GALLERY: TAYLOR SWIFT & ZAC EFRON CATCH UP WITH BETTY WHITE & DANNY DEVITO AT THE LORAX PREMIEREZac, 24, and Taylor, 22, attended the premiere of The Lorax in Universal City, Calif., on Sunday. The Read More >>