The 23-year-old eschewed her usual preference for thigh-grazing minis, in favour of a stunning white appliqué Chanel Couture gown with sheer skirt - the hottest red carpet trend of the moment.
And as current face of Chanel's Mademoiselle handbags, it comes as little surprise to see the starlet showcasing a design from the French fashion house.
Blake added her own California-girl touch to the frock, by teaming it with a teased fishtail side plait, glittering gold hair piece and a smattering of Lorraine Schwartz jewels.
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Click on our gallery below to see our pick of Miss Lively's Perfect 10 style moments: