Sienna Miller is officially back in her boho chic era

Sienna Miller wearing a blue frill-lined gown at Cannes Film Festival
(Getty)

Pinpointing a specific idea – be it an era, movement or muse – is one of the key ways that celebrity stylists deliver impact.

A red carpet look that can be devoured by the fashion cognoscenti? Practically guaranteed to hit the spot.

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One of those who understood the assignment recently at Cannes Film Festival was runway royalty Naomi Campbell.

Styled by Zendaya's go-to "image architect" Law Roach, the supermodel powerhouse made La Croisette her catwalk in a striking piece of Chanel couture, dating back to 1996. The original wearer of the gown? In a display of iconic Naomi behaviour, she took inspiration from herself.

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Sienna Miller wearing a blue frill-lined gown at Cannes Film Festival
Sienna opted for a Chloé gown (Getty)

And she's not alone – actress Sienna Miller seemingly tapped into her own quintessential noughties It-girl aesthetic for the screening of her latest flick, an epic Western titled Horizon: An American Saga, on Sunday night.

Leaning into her much-heralded boho days, the fashion luminary was an ethereal dream in a frill-lined Chloé gown.

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Sienna Miller wearing a blue frill-lined gown at Cannes Film Festival
The actress looked characteristically radiant at the screening (Getty)

The piece had a beautiful, slightly 1970s appeal, featuring a flowy silhouette and a floor-sweeping train. Cut from a powdery, muted cornflower blue fabric to complement her lit-from-within-complexion, the gown's semi-sheer fabric had an almost feather-light quality to it.

The Extrapolations star styled her romantic dress with a dazzling necklace, prettily opulent but not diverting from the drama of the frills.

Sienna Miller wearing a blue frill-lined gown at Cannes Film Festival
Sienna kept things pared back on the beauty front, save for a pretty berry lip (Getty)

For her beauty look, Sienna turned to long-time makeup artist Wendy Rowe for radiant skin and a blurred berry lip, and relied on hairstylist Earl Simms for insouciant, cool-girl waves.

Bypassing traditional references because you are in fact the real deal? Colour us obsessed.