Photos from the set of Zac Efron-Robert De Niro movie filming in Atlanta

Zac Efron and Robert De Niro are in Atlanta working on a movie that's also starring Aubrey Plaza, Julianne Hough, Zoey Deutch, Dermot Mulroney and Atlanta's own Catherine Dyer.

The project was tentatively titled "Dirty Grandpa" although more recent casting calls I've seen now refer to it as an "untitled" project. It's very common for a movie to change names (more than once, in fact) from filming to release date. Maybe they can come up with something a little less cringe-inducing. Yeeesh!

The movie is filming at locations both ITP and OTP, neither of which is featuring nice weather these days. Luckily the ladies brought warm parkas and Uggs.

I'm told Mulroney dined at The Spence on Tuesday night with a group of about 10 cast and crew members. They delighted in numerous house specialities including pastas, short rib and whole grilled fish. Here's hoping they enjoy the rest of their time here - and that the weather improves.