“This jerk is trying to sneak a picture of me @zacefron,” Anna, 29, captioned on Instagram, catching Zac, 27, in the act.
Zac came back with: “Caught this sneaky sneak trying to sneak a pic.”
Anna also caught co-star Adam Devine snacking and sleeping while reading Men’s Health mag.
“@andybovine showin’ you how it’s done. (Only one of these photos was staged),” she captioned.