Z STAFF
Zac continued filming “Dirty Grandpa” down in Georgia, and it looks like there’s a naked motorcycle scene — but for some reason Zac’s a little ass-shy. A butt-double was photographed stepping in for Efron.
Based on pics … you’d think Zac would be happy to flaunt his cheeks, but instead it was the double’s butt in the spotlight.
Real bummer — but at least now you’ll know when the flick comes out.
http://ce.ivyrc.com/zac-efron-my-butt-is-not-for-your-viewing-pleasure-photo/