Kate Bosworth

Ron Asadorian/Splash News

Kate Bosworth definitely brightened up the Big Apple set of her new movie on Wednesday.

The 31-year-old actress showed off her fiery new 'do as she prepared to play Julianne Moore's daughter in the upcoming drama, Still Alice.

Sporting a grey T-shirt, a black jacket, and a pair of skinny jeans tucked into some funky-looking boots, Bosworth appeared ready to do business.

One of her other costars, Kristen Stewart, was also on hand as well. The Twilight highlight portrays Bosworth's sister in the flick. And while the 23-year-old hasn't dyed her hair like Bosworth, her brunette locks certainly seem to have a tinge of red nevertheless.

Kristen Stewart

Alessio Botticelli/GC Images

Speaking of Stewart, the gal recently tried her hand at directing by taking charge of her pal's new music video. She was recently in Nashville helming a music video for her BFF Sage's band, Sage + the Saints.

"Kristen has always wanted to direct, and no better person to do that for than Sage," a source told E! News at the time.

As for Still Alice, which also stars Alec Baldwin, it tells the story of a psychologist who discovers that she's suffering from an early onset of Alzheimer's disease.

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