Last month, a tabloid rumor caught fire amid the Brad Pitt-Angelina Jolie split that Pitt had had a premiere with French actress Marion Cotillard. In dismissing the claims outright, Cotillard also announced her pregnancy with longtime partner Guillaume Canet; she and the director have been together since 2007 and their first child was born in 2011. Yet, had she not announced it, we might never have guessed — from her appearance front-row at Dior to the four films she's premiering this year, her red carpet style has been as chic and minimal as ever. For the latest, the premiere of her new film Mal de pierres (From the Land of the Moon, in English, in which she stars with Louis Garrel), which debuted at Cannes earlier in the year, she rocked a simple Dior shift dress, which, paired with a few retro styling details, exuded pure mid-century French starlet vibes.

Marion Cotillard in Dior at the premiere of 'Mal de pierres' in Paris, France, October 2016.

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Who: Marion Cotillard.

When: Monday, October 10.

Where: The premiere of her new film Mal de pierres at the Cinema Gaumont Marignon theater in Paris, France.

What: A black high-neck shift dress by Dior with fishnet tights and iridescent patent pumps.

Why: A simple, ultra-French Dior shift dress makes the perfect canvas on which to project a retro Parisian look. Cotillard, who sat front-row at Maria Grazia Chiuri's debut at Christian Dior as well as the brand's fall couture show, is also the latest face of Lady Dior. Which is to say, she has the fashion bona fides. A red lip and understated glamorous dress channel Edith Piaf, while Cotillard's edgy side-parted coif brings the whole aesthetic into the contemporary. Then there's the matter of fishnet tights, a cabaret staple that Cotillard might singlehandedly make a thing again. (We can only hope.) Never one to overdo it, the actress keeps the rest of her look pretty neutral — a simple nude eye and sensible patent pumps, albeit pumps with a glitzy embellished heel — in order to allow the statement pieces to stand out.