Filming Dirty Grandpa on April 27 and 28, Zac Efron worked his toned butt in a pair of tight briefs (and before that, he rocked a crop top on set!); see the sexy (and hilarious) photos
This article originally appeared on Usmagazine.com: Zac Efron Goes Nearly Nude in Tight Briefs, Plus Check Out His Fringed Crop Top! Sexy Photos
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