Sienna Miller Wear Dramatic Black Plunge Gown to the Venice Film Festival

sienna miller wearing sunglasses — (Image credit: Getty Images)

Sienna Miller wore a black velvet gown that nearly plummeted to her belly button at the 81st Venice International Film Festival on Friday, Sept. 6. The dress was vintage Giorgio Armani but the design felt right at home on a red carpet peppered with plunging necklines. Even Lady Gaga chose a plunging Christian Dior Haute Couture gown to walk the Joker: Folie à Deux red carpet with fiancé Michael Polansky. Julianne Moore also got the memo in time to commission a gold sequin gown with long sleeves and—yes—a deep V-neck from Bottega Veneta.

But the trend didn't stop there. Across the globe, Dakota Johnson was busy delivering her bohemian spin on the deep V-neck at the Bulgari Studio Party during New York Fashion Week, pairing a chocolate brown lace slip dress with an oversized pendant. Then, the very same night in Los Angeles, Meghann Fahy and Nicole Kidman both turned up in clavicle-baring gowns for the premiere of their new Netflix series The Perfect Couple. Styled by Jason Bolden, Kidman opted for a shimmering, semi-sheer Ferragamo halter dress. Fahy and stylist Thomas Carter Phillips, on the other hand, selected a black lace dress from Victoria Beckham.

sienna miller in a black gown — Sienna Miller's Venice International Film Festival dress pushed the plunge neckline to its limit.

Miller accessorized the stunning velvet number with a pair of strappy slingback sandals from celebrity-beloved brand Aquazzura.

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Often, stylists choose to let the deep V-neck shine by leaving the chest otherwise bare. Miller, however, topped off her take on the trend with a lotus-shaped diamond pendant necklace and a chunky diamond cocktail ring, both courtesy of De Beers. But in a clever added touch, the actor balanced out her mega-glitz jewelry by throwing on a pair of round black sunglasses. And thank goodness she did, because I'm obsessed with the tension between that stunning $80,000 necklace and her mysterious mob wife shades.

Miller further accessorized the stunning velvet number with a pair of strappy slingback sandals from celebrity-beloved brand Aquazzura.

Sienna Miller at the Venice film festival — Miller accessorized with mob wife shades and glittering De Beers diamonds.

De Beers Enchanted Lotus Necklace in White Gold

Aquazzura So Nude 105 Sandal in Black

Is clavicle the new side boob? Maybe it would be more accurate to say "no bra" is the new "no pants." It's too soon to be definitive, but the New York Fashion Week runways are certainly making a strong case for the trend with plunging necklines popping up at the likes of Ralph Lauren and Grace Ling. The true test, of course, will be to see whether any of those looks make the plunge from catwalk to the Emmys red carpet on September 15.

Hanna Lustig is a staff writer at Marie Claire, where she gets to gab every day about the topics she holds most dear: fashion, beauty, and celebrity. Hanna’s editorial journey began with formative internships at Elle and InStyle, where she was lucky enough to work for some of the smartest women in media while she was still in college at the University of Tennessee. Hanna then accepted a digital culture reporting fellowship at Insider, where she helped carve out a new beat dedicated to covering influencers. Those experiences later served her well as a staff writer at Glamour, where she developed a knack for spinning quick turnaround celebrity news and trend reporting into juicy feature stories. Some of her greatest hits include an earnest ode to the no-pants trend, this meticulously reported feature exploring the rise of endoscopic facelifts, this snappy take on the Chanel-designed fantasy of Sofia Richie’s wedding, this tribute to WAGs past and present, and this timeline of Katie Holmes’s life and career as told through her denim collection.

Diane Keaton once hung up on Hanna during an interview, but thankfully that mishap did not derail what has otherwise been a deeply fulfilling career writing for and about women. As one of Marie Claire's resident experts on style and culture, her current coverage ranges from exploring TikTok's contrast makeup theory and the return of the boat shoe trend to interviews with costume designers for hit shows like Nobody Wants This and The Penguin. When she’s not at work, Hanna can probably be found listening to pop music, talking to her dog, and gossiping with her best friends. For more of Hanna’s perfect opinions on pop culture, you can follow her on Instagram and X.