Sienna Miller’s ‘Brit Girl’ Glamour for Grazia UK

Sienna Miller unveils a sultry yet understated look for the Grazia UK cover, embodying a timeless (and frankly unapologetic) cool for the new season.

There are fashion moments, and then there are fashion moods. Sienna Miller, the consummate style chameleon, has always been an expert at creating the latter. For her turn as the cover star of Grazia UK’s September 1, 2025 issue, she unveils a look that perfectly captures the “Brit Girl Summer” ethos proclaimed on the cover.

On the cover, she wears a black velvet dress with a daringly deep V-neck, its plunge creating a stunningly dramatic silhouette. Paired with oversized black sunglasses and a confident, genuine smile, the look is pure, unbothered glamour. It’s the kind of effortless sophistication that suggests she’s not trying at all—the very essence of that inimitable British cool. The image hints at “Heatwave Hacks” and “Melt-Proof Make-up,” positioning her as the go-to authority for looking flawless when the temperature rises.

Inside, the magazine celebrates Miller alongside other style stars, cementing her place in fashion’s inner circle. The article notes her style “dances both a sharp balletic line and a more-than-flouncy pastiche,” a perfect description of her ability to pivot from tailored elegance to bohemian whimsy. This duality is what makes her so endlessly fascinating. She possesses an innate ability to make an outfit, no matter how intricate, feel entirely her own.

Her enduring appeal lies in this very thing: a refusal to be put in a box. In her world, a plunging velvet dress can sit comfortably next to a look featuring a crinkly white skirt and a crisp crop top. It’s a testament to her as a star who isn’t just following trends but defining them. For more on the personal and professional lives of top stars, check out our popular celebrities section.