See ya later, #HotGirlSummer, daylight past 7 p.m. and Katherine Heigl's bright-blonde locks.
Not just two days past Labor Day, Heigl has fully embraced the impending cold by ditching her golden mane for a dark brunette color.
OK, so it's not totally tied to the seasons. Heigl revealed that the hair color is for her role in the new Netflix series Firefly Lane. The Knocked Up star showcased the transformation on her Instagram Stories, then posted an "after" pic to her profile.