Zac Efron’s ‘Dirty Grandpa’ Co-Star Robert De Niro Tells Him to ‘Break a Leg’!

Zac Efron holds onto a Lionel train car box while stepping out of a home on the set of his upcoming film Dirty Grandpa on Wednesday (January 14) in Atlanta, Ga.

The 27-year-old actor just started working on the film earlier this week and was joined by his co-stars Julianne Hough, Robert De Niro, and Dermot Mulroney.

PHOTOS: Check out the latest pics of Zac Efron

Zac recently posted a sweet note he received from Robert and tweeted, “Cool way to start my day… #breakaleg.”

FYI: Zac is wearing a vineyard vines 1/4 zip up.

20+ pictures inside of Zac Efron shooting Dirty Grandpa…

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