The actress, 37, had a fringe cut in and, as is the showbiz norm nowadays, debuted her new 'do with an Instagram picture.
"Someone got a haircut courtesy of @renatocampora #hair #genius #brigittebardot #60s #fashion #iloveitsomuch," Jessica wrote, suggesting that late blonde bombshell Brigitte was the inspiration behind her new look.
The shot showed Jessica posing with her new fringe while her hairdresser Renato Campora styled her locks.
Renato also shared a snap of the star, writing: "What a greay day to cut bangs on #JessicaChastain @chastainiac #outwithabang".
Jessica before her new fringe
The news of Jessica's new hair 'do comes just days after Vanessa Hudgens debuted her turquoise locks and Kaley Cuoco showed off a pixie crop.
Both actresses took to social networking site Instagram to show off their new tresses.