Pregnant Sienna Miller, 43, Shines in Sheer White Dress on the Red Carpet, Igniting a Stir

The pregnant actress's recent appearance comes after she shared details about her family life in 2024 following the birth of her second child.

On December 1, 2025, Hollywood star Sienna Miller, 43, left mouths agape with her striking appearance at The Fashion Awards at the Royal Albert Hall in London, England.

While some praised her glowing beauty, others expressed qualms concerning the outfit's revealing nature, with netizens even going so far as to point out their exhaustion with the sheer/underwear-on-display trend.

A Glowing Sienna Miller Is a Vision in Sheer White

Miller turned the carpet into a personal runway, exuding ethereal confidence as she proudly showcased her growing baby bump in a floor-length, sheer white gown by Givenchy. The delicate, lingerie-inspired piece featured a structured white bra bodice and soft tulle draping that cascaded effortlessly to the floor, offering a romantic yet daring silhouette.

The gown's translucent fabric revealed a matching pair of white undergarments, a bold styling choice that sparked immediate conversation online.

Balancing elegance with edge, Miller completed the look with a pair of fluffy, feather-trimmed mules peeking through the mesh hem — a whimsical touch that added texture and playfulness. Her long, tousled blonde waves framed her glowing face, while statement drop earrings and a warm, effortless smile brought the ensemble to life.

The 43-year-old actress, who is expecting her third child — her second with 28-year-old actor Oli Green — radiated both maternal grace and fashion-forward confidence, appearing completely at ease in her skin and in the moment.

'This Is So Tired': Fans Get Heated over the Look

As photos from the event quickly made their rounds online, the internet became a sounding board for mixed reactions — a collision of admiration, criticism, and cultural commentary. While many praised Miller's appearance, others took issue with the bold styling choice.

"Shes [sic] gorgeous, but that dress is so unnecessary," one netizen remarked, echoing a sentiment shared by several who found the look excessive. Another simply wrote, "This is a night gown," while someone else added, "looks [sic] more like lingerie."

A more blunt critique declared, "Bra and panties. WHITE bra and panties. This is so tired," and yet another viewer asserted, "She's gorgeous and glowing, but naked dresses are a fashion trend that needs to end."

One of the more provocative takes came from a netizen who lamented, "Truly speechless. A sheer nightie, a baby bump, and a sea of applause — as if vanity wrapped in vulnerability is a noble act. What are we becoming, when exhibitionism is mistaken for empowerment, and modesty for irrelevance?😳😳😳."

Despite the criticisms, Miller had her fair share of defenders. "She looks incredible which [sic] is why she's in her undies and fair enough lol," one fan stated, while another enthusiastically opined, "Hottest pregnant woman in fashion history." A different admirer chimed in admiringly, "She'll always be the boho queen. She looks stunning here."

Beyond the Glitz: Sienna Miller's Candid Journey Through Motherhood

Amid the digital whirlwind surrounding her latest red carpet moment, many fans have also been reflecting on the softer, more personal side of Miller's journey — her evolving role as a mother. Before making headlines with her third pregnancy, the actress had already opened up about life as a then-mom of two and the quiet joys that came with it.

Miller first became a mother in 2012 when she welcomed a daughter with former partner Tom Sturridge. In January 2024, she expanded her family with the arrival of her second daughter, her first child with Green, whom she's been dating since 2022.

Between the two births, Miller was candid about feeling the pressure to grow her family and shared that she had frozen her eggs at 40 — though she's never confirmed whether that decision played a role in her two most recent pregnancies.

In a heartfelt interview with E! News in June 2024, the "Horizon: An American Saga" actress shared how her then-11-year-old daughter was adjusting to her new role as a big sister. "Initially, it was a lot for her," Miller admitted, but added that things had quickly turned around.

The doting mom continued, "Now she is in heaven." She went on to share that the then-six-month-old was already "idolizing" her big sister and would light up in her presence. "Now that the baby can react," Miller said at the time, "[she] is clearly in love with her big sister."

As for how she was handling the adjustment to newborn life again, Miller didn't hold back from keeping it real, expressing her plan to catch up on sleep in the summer. "Maybe a bit of sleep," she quipped. "I have a new baby."

The comment came during a whirlwind promotional tour for "Horizon: An American Saga," in which she starred alongside Kevin Costner and Sam Worthington. During the Cannes Film Festival premiere in May 2024, she was joined by both her oldest and Green — a rare public appearance for the blended family.

Though Miller's daughter briefly played with the idea of stepping into the spotlight herself, Miller revealed that the young girl ultimately decided against a cameo in the film.

According to the actress, her daughter "wanted a line," but "chickened out" at the last minute. Still, Miller spoke warmly of the experience, noting, "What's so lovely about this set is anyone is welcome."

One Woman, One Dress, and the Internet Divided

Whether turning heads on the red carpet or opening up about the quiet moments of motherhood, Miller continues to navigate public life with a rare blend of boldness and vulnerability.

Her Fashion Awards appearance may have ignited debate, but it also reminded fans of her unwavering individuality — a trait mirrored in the candid way she speaks about her growing family.

At 43, with baby number three on the way and a full life already in motion, Sienna Miller seems to be embracing this chapter on her own terms — sheer dress, sleepless nights, and all.