Blake Lively's Nail Art at the 'A Simple Favor' Premiere Had a Secret Reference to the Film

And you'll never guess how much the polish costs.

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At the premiere for her new movie A Simple Favor, look made clear that she has a keen eye for detail. While you're marveling at her outfit, you might have missed a thing or two–like a martini glass accent on her fingernail, which caught.

Stepping out onto the red carpet alongside husband Ryan Reynolds and co-stars Anna Kendrick and Henry Golding for the film's premiere Monday night (September 10), Lively stunned in a sharply tailored black matte Givenchy suit with glitter coattails. But that's not all. Lively, who has a history of matching her nails to her outfit, added a Swarovski crystal martini glass to her left ring finger/accent nail—an homage to the film itself, where a martini glass is a recurring symbol.

The attention to detail is astounding, and Lively worked with celebrity nail artist to achieve the dashing look. The surrounding nails–as in, the ones not martini-fied–were first painted in a layer of from LeChat Nails, followed by Lively's pick, in Rock the Mic, a shimmering black to match with Blake's black blouse. The nails were then topped with LeChat Nails' .

For the accent nail, Elle used LeChat Nails' Dare to Wear in , a creamy black, and crafted the martini glass from Swarovski crystals soaked in polish and let dry for best application. Oh, and the polishes Blake used? Only $7.

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Whether you're a martini-drinker or not, you can definitely appreciate this nail look.

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