The former Gossip Girl star, who is one of Hollywood's most sought-after actresses and has a moviestar husband to boot, follows in the footsteps of superstars including Jennifer Lopez and Beyoncé as she becomes a spokesmodel for the beauty giant.
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Blake is known for her chic style that oozes Hollywood glamour. Speaking about her style secrets an interview with Lucky magazine, Blake revealed that she likes "a waistline, a nip almost right under the boots, because I want the lines of the clothes to make a journey around my curves, rather than travel straight up my body."
The 26-year-old, who married Ryan Reynolds in September 2012, will appear in a series of ads for L'Oréal in 2014.
"I am thrilled and honoured to join the incredible women who represent L'Oréal Paris," she said in a statement.
Talking about L'Oréal's famous slogan 'We're worth it', Blake added, "What an important value to instill in women. That beauty is rooted in confidence. That is key."
Explaining their decision to recruit the blonde beauty, a spokesperson for L'Oréal said, "Blake embodies all the modern codes of Hollywood glamour.
"She has become a beauty icon for a whole generation with her gorgeous gold-dipped hair, luminous gaze and drop-dead smile. Today, this strong, charismatic and definitely glowing actress is joining the L'Oréal Paris family. And we're so proud to welcome her."