Look out, he'll kill you with cuteness! Zac Efron is back (and yeah, we know he hasn't really gone anywhere). The superstudmuffin and über-genial High School Musical star gets his twinkly-smiley thing cranking while remaining charmingly humble in this backstage vid for his Teen Vogue cover shoot.

Even in featherweight fluff like this, Zac is the mack. Sigh.

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