Julianne Moore

Splash News, Matt Sayles/Invision/AP

Out of all the celebrity hair color changes recently, this one might be the most shocking: Julianne Moore—arguable Hollywood's most famous redhead—has gone blond.

The actress was spotted on the set of her new movie Maps to the Stars in Toronto yesterday with golden locks.

Although the color change is clearly for her new role in the David Cronenberg-directed film, a deep center part confirms it is not a wig but in fact the real deal.

Moore also appeared to go completely makeup-free and donned a casual gray robe while on set of the drama, which also stars Robert Pattinson, John Cusack and Mia Wasikowska.

This isn't the first time the star, 52, has gone blond. In 2008, she also lightened her strands for the film Blindness.

However, the experience only solidified her love of fiery strands.

"I had to dye my hair blond for a part and it was very disorienting and it was the first time I realized I very heavily identify myself as redhead," she later explained.

The actress—who has two redheaded kids—wrote about her experience growing up as a ginger in the children's book Freckleface Strawberry and the Dodgeball Bully.

So it's a pretty good bet once filming wraps she will be back to her signature scarlet strands.

Do you like Julianne's new blond look?

PHOTOS: Hollywood's hottest redheads

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