The former Friends actress was spotted rocking her brunette bob on the set of Squirrels To The Nuts in New York on Thursday (18 July), while hanging out with her German Shepherd co-star.
Jennifer created quite a stir earlier this week when she arrived on set with the dramatically different do, but rest assured, Jennifer hasn't chopped off her flowing blonde locks: it's definitely just a wig!
The 43-year-old is known for having a strong love of dogs and was left heartbroken back in 2011 when her corgi-terrier mix Norman died at the age of 15.
Jen later had a tattoo of his name inked on her foot as a permanent reminder of her loyal companion, who used to accompany her to film sets around the world.
She once said she wouldn't mind if a boyfriend shared the same traits as Norman, joking: "It wouldn't be bad if, when a man comes home, he'd run to his woman with his tail wagging. This sort of excitement is something I've always missed in a man to be honest."
Jen also has two other dogs: a German Shepherd called Dolly and Sophie, a pit-bull mix she adopted with boyfriend Justin Theroux last year.