[Rex Features]
She debuted the look at the look while filming Still Alice alongside Julianne Moore in New York, snapped on-set in Manhattan's Harlem district with her now warm red locks pulled into a messy bun.
Plus she tweeted a selfie to flaunt her rosy tresses last night. The filtered snap showed her auburn locks falling infront of her face. 'Strawberry Fields #StillAlice,' she wrote.
The new caramel shade flatters Kate's fair complexion, bringing out the the blue in her eyes and enhancing the shade of her pink lipstick.
It's not the first time Kate's gone flame-haired, she sported a copper 'do in 2010 cowboys vs aliens movie The Warriors Way.
'I wanted her to be a redhead, and I was hellbent on that,' she said at the time. 'I was like, 'How can you have this fierce, fiery, crazy, feral woman in the middle of a desert with jet black hair? I love jet black hair, but she has to be a redhead.'
Kate's not afraid to switch up her hair colour, she went brunette for both 2006's Superman Returns and 2003's Wonderland.
'I dyed my hair for Wonderland. I love being a brunette and I really enjoy playing with hair colour,' she said 2013. 'But dye is just so hard on your hair.'
See Kate's hair evolution
