Charlize Theron Hits the Oscars Red Carpet in a Dramatic Backless Dress and New Brunette Hair

All eyes were on Charlize Theron‘s daring new ‘do at the Academy Awards.

The actress, who is known for her signature blonde hair color, debuted a deep chestnut hue on the Oscars red carpet Sunday night.

Theron’s hairstylist Adir Abergel also decided to chop her hair into a chic chin-length bob styled in a deep side part tucked behind one ear for the occasion. “Decided to chop it all off before the big moment. #cantwaittoshare #oscars2019 #hairbyadir,” Abergel captioned a photo on Instagram.

Be sure to check out PEOPLE’s full Oscars coverage to get the latest news on film’s biggest night.

The Oscar presenter paired her eye-catching new hair change with a stunning Dior Haute Couture gown. From the front, the long-sleeve periwinkle confection looks sleek and sophisticated, but from behind the backless design captivated all the attention.

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She completed the stunning look with an on trend orange-red lip and a dazzling diamond Bulgari serpent necklace.

The second Theron hit the red carpet, fans went wild over her brunette ‘do on social media. “Charlize Theron cut and dyed her hair and I love it, also a beautiful Dior dress!!” one person wrote on Twitter.

Another fan said, “Is Charlize Theron trying to kill us ? Because it’s working! #Oscars.”

The 91st Academy Awards are broadcasting live from Los Angeles on Sunday, Feb. 24 at 8:00 p.m. ET/5:00 p.m. PT on ABC.