Zac Efron [1] stepped out on the set of Dirty Grandpa on Monday in Georgia, and the best part was that he happened to also be wearing a crop top. It's been weeks since we last saw his body — he went shirtless at the MTV Movie Awards [2] — so we're just glad to get another dose of those abs. Zac's getting back to work after a bit of relaxation; earlier this month, he vacationed in Mexico with his girlfriend [3], Sami Miró, and just last week they made a sweet smoothie run in LA [4]. Keep reading for the main attraction, and then get all the information about Sami [5], the blessed girl who gets to see those abs in person.