Zac Efron & Robert De Niro Play Flip Cup Against Zoey Deutch & Aubrey Plaza for 'Dirty Grandpa'

Zac Efron looks super preppy as he shoots a drinking game scene for his new film Dirty Grandpa on Tuesday (May 5) in Tybee Island, Ga.

The 27-year-old actor was joined by his co-stars Robert De Niro, Zoey Deutch, and Aubrey Plaza.

It looked like they had a blast shooting! There were a ton of extras for the party scene.

Also spotted on set that day was Zac‘s girlfriend Sami Miro, who sat off to the side as he filmed.

15+ pictures inside of Zac Efron, Robert De Niro, and more on set of the movie…