Er, Squirrels To The Nips?

On Wednesday Jennifer Aniston stepped out on New York City on the set of her new flick, and it looks like she left her bra at home! She may be 44 years old, but she's still just as toned as she was in her Friends days...

Squirrels to the Nuts is a rom com about "a group of city dwellers, including call girls and detectives, whose lives intertwine." Owen Wilson plays a married Broadway director who falls for a hooker (played by Brie Larson), and Olivia Wilde also stars in the film.

Despite the awful wig, Jen looks like she's been having a blast shooting her latest project ... but maybe this also has something to to with the fact that her main squeeze Justin Theroux has been by her side when she's not on the job?