The 22-year-old Australian model - who is set to walk in this year's prestigious Victoria's Secret Fashion Show - joins Jane Fonda, Eva Longoria and Andie MacDowell as part of the L'Oréal family and will make her debut for the brand in the company's upcoming show which takes place at Paris Fashion Week on September 30, on a floating runway on the River Seine.
Speaking to WWD, Duckie said: "I'm honored to represent L'Oréal, a brand that celebrates infinite ways to be beautiful and makes products for all women. I'm looking forward to helping more girls love the beauty of their dark skin.
"In my mind, I'm going back in time and telling the young girl I was, 'Dream big, work hard and trust in yourself girl, because one day you're going to say yes to the number-one beauty brand'.
The rising star - who has become the latest muse for chart topper Rihanna's Fenty Beauty brand - shared her good news with her followers on her Instagram account, uploading an upcoming editorial shot which she captioned "Beyond blessed to be the new global spokeswoman for @lorealmakeup (sic)"
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After making her debut, Duckie will front campaigns for L'Oréal's Volume Million Lashes, Infallible Foundation and Colourista products.
Speaking about the new collaboration, L'Oréal Global President Pierre-Emmanuel Angeloglou said: "While emerging in a new generation of models, Duckie Thot knows how to use her voice to match the strength of her images. Her energy and message of inclusivity make her a perfect recruit for the L'Oréal family: original and confident in her self-worth.
"We're delighted to welcome Duckie and for her to continue motivating women to believe in their own beauty around the globe."