Jennifer Aniston, hiding her long blonde hair under a brunette bob wig, was visited by fiance Justin Theroux on the set of Squirrels to the Nuts in New York City on July 17. Credit: (2)

Not quite "The Rachel!" Jennifer Aniston looked nearly unrecognizable while trying to work a shaggy brunette bob on set Wednesday, July 17. See more photos of Jennifer's on set bob at PopSugar.

Aniston hid her long blonde hair under a short brunette wig with side-swept bangs while filming her new movie, Squirrels to the Nuts, in New York City. The 44-year-old adventurous actress got into character by pairing the short 'do with a low-cut blue dress in one scene, and black tank top and dress pants in another.

Between scenes, Aniston kept cool in the Big Apple heat wave by wearing a navy blue mini dress, fedora and shades. The Friends star also received a special visit from fiance Justin Theroux at her trailer. Her husband-to-be was spotted on set wearing a tank top, jeans, boots, baseball cap and sunglasses.

On Saturday, Aniston and Theroux, 41, attended pal Jimmy Kimmel's wedding to Molly McNearney in Ojai, Calif. "Jen and Justin seemed very happy and in love," a source told Us Weekly of the couple, who got engaged in August 2012. "She had her hand on Justin's knee for most of the ceremony and was intently listening."

Tell Us: Do you think Aniston can pull off a brunette bob?