Kate Mara, is that you? Recently The House of Cards actress stepped out sporting an unfamiliar look: blond hair! Shocked? Rooney's sister certainly looks a lot different than her sibling, now that she's gone for lemon-frosted locks!

Mara has been undergoing this gradual makeover for ome time now. From her natural auburn hair to chestnut brown, dirty blond and eventually platinum, the Hollywood hottie has proved her flawless complexion can sport any hue under the rainbow. Lucky girl!

Kate Mara Kate Mara showed off her lighter locks during the film premiere of Her.

The sexy star strutted her stuff in L.A. as she showed off her new look to the world. Sporting a sexy crop-top paired with a high waisted pencil skirt that featured a chic embroidered floral overlay, Mara flaunted hair that contrasted flawlessly against the midnight blue ensemble. The darling diva even picked the perfect pair of pumps to debut her new mane! The graduated heels correlated seamlessly with Mara’s ombre golden-to-lemon locks.

Seriously, we can’t stop starring at her gorgeous hair. And talk about good timing! With the Golden Globes right around the corner (Sunday, Jan. 12) Mara will be making waves with her new blond bob, and we’re sitting on the edge of our seats to see what designer the actress will wear that day. But whoever they are, they’ll have the most stunning muse!

Kate Mara Kate Mara looked sleek and chic with her brunette bob at the 65th Primetime Emmy Awards.

What do you think about Mara’s lighter look? Do you prefer the actress with edgy, chestnut hair or do you think the blond hue agrees with Mara? Whatever you decide, we’re just happy we have another hair-spiration photo to bring to our stylist this weekend!

Be sure to catch Mara walk the red carpet this weekend when she struts her stuff at the 70th Annual Golden Globes on NBC at 8 P.M. ET.