PHOTO: Why Did Charlize Theron Shave Her Head?

The South African beauty has buzzed off her long blond locks for her role in the upcoming adventure movie Mad Max 4: Fury Road

Charlize Theron was photographed sporting a new look Monday while walking around Beverly Hills with her 6-month-old son Jackson. The 36-year-old actress -- who flaunted long hair while promoting her summer hits Snow White and the Huntsman and Prometheus in recent weeks (and in the past has pulled off a short bob) -- has shaved her head! (Check out the photos in the E! News report below.)

So why the big change? Well, Theron's rep confirms to Us Weekly that the actress buzzed off her blond locks for her role as Furiosa in the upcoming post-apocalyptic action movie Mad Max: Fury Road. She stars in that long-awaited, long-delayed film opposite Tom Hardy (a.k.a. Bane from The Dark Knight Rises) and Nicholas Hoult (a.k.a. Beast from X-Men: First Class/The Guy Jennifer Lawrence Is Dating). The film, to which Theron has been attached since it was first announced back in 2009, is finally ready to go in front of the camera -- and Charlize no doubt felt it was time to start getting into character.

"It's been three years: It's time to skin this cat already!" Theron recently told Us of Mad Max. "I'm very excited about it." We'll say!

This isn't the first time the actress has drastically changed her appearance for a movie. Let's just say there's a good reason the South African beauty won an Oscar for her performance in a little 2003 movie called Monster.

Theron hasn't fully flaunted her buzz cut yet -- when the paparazzi photographed her, she was wearing a pesky bowler hat that prevented a full view of her sleek new 'do -- but we're betting she'll join the ranks of Natalie Portman and Anne Hathaway as A-list beauties who look just as sexy when they go shaved.

WATCH: Charlize Theron Gets a Drastic New 'Do! Likes or Yikes?

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