Jennifer AnistonJennifer Aniston has one of the most coveted hairstyles in Hollywood.

From the famous "Rachel" layered 'do to her pin-straight strands and recent short and sassy bob, the 42-year-old actress has rocked an array of lust-worthy locks.

But now she's joined the dark side with a new brown hairdo.

Our friends over at BeautyHigh peeped the new movie poster and trailer for Aniston's latest film, "Horrible Bosses," in which she plays a sexually inappropriate dentist who gets too close to her employees.

For her good girl gone bad role, she dyed her golden mane a rich chestnut shade accentuated with brow-grazing bangs.

What do you think about Aniston's darker 'do?