AJ Michalka hits up her local cinemas with a few friends on Saturday afternoon (December 17) in Calabasas, Calif.

The 21-year-old actress and big sis Aly (not pictured) hit up the Happy Madison Holiday Party the night before.

“So much fun last night! [Adam] Sandler knows how to throw a party :p Xo A and A,” the girls tweeted to their good friend Quinton Aaron.

It was just announced that Aly and AJ‘s Violet House production company will be helping to get Laura DeStefano’s “Wither” to the big screen.

10+ pics inside…