INTRODUCTION
Sienna Miller (@siennathing) is the quintessential British-American style icon who has spent the last two decades evolving from the “boho-chic” muse of the 2000s into one of the most respected dramatic actresses of her generation. Known for her effortless ability to blend high-fashion poise with a raw, indie sensibility, she has become a permanent fixture of the global cultural landscape. In 2026, Sienna is embracing a profound “second act,” balancing a thriving family life in the English countryside with a slate of prestige film and television projects.
Birth name: Sienna Rose Diana Miller
Career
Actress, Producer, Fashion Designer, Humanitarian (Global Ambassador for International Medical Corps)
Birthday
December 28, 1981
Age: 44
Zodiac Sign:
Capricorn
Birthplace: New York City, U.S. (Raised in London, England)
Nationality: British-American
HOW BIG IS Sienna Miller ON THE NET?
Sienna remains a perennial tastemaker, though she famously maintains a more enigmatic digital footprint than her peers. In early 2026, her name has dominated fashion headlines following her show-stopping maternity reveal at the 2025 Fashion Awards in London, where she debuted her third pregnancy in a sheer Givenchy look that instantly went viral. Her net worth is estimated at $18 million, a figure bolstered by her transition into producing and her long-standing relationship with luxury houses like Chloé and Gucci.
HOW DID Sienna Miller become famous?
Sienna’s ascent began in 2004 with back-to-back breakout roles in Layer Cake and Alfie, the latter of which propelled her into a whirlwind of global fame. While her early career was often overshadowed by intense tabloid scrutiny, she successfully pivoted to “serious” cinema with a series of transformative performances in American Sniper, Foxcatcher, and American Woman. By 2026, she has solidified her status as a prestige actor, recently starring in Kevin Costner’s Western epic Horizon: An American Saga and the upcoming high-stakes divorce drama The Split for Sky Atlantic.
BEFORE THE FAME
Born in New York to a banker father and a South African model mother, Sienna moved to London as a toddler. She was an independent, creative child who attended the rigorous Heathfield School in Ascot before heading back to New York to study at the Lee Strasberg Theatre and Film Institute. Before her film breakthrough, she worked as a photography model and briefly designed clothes with her sister, Savannah—early indicators of the “boho-chic” aesthetic that would eventually spark a global fashion revolution.
CLOSE WITH (ASSOCIATED);
Sienna’s personal life in 2026 is centered around her partnership with actor-model Oli Green (28), with whom she is currently expecting her second child (her third overall). She shares her eldest daughter, Marlowe Sturridge (13), with ex-partner Tom Sturridge, with whom she maintains a famously close and modern co-parenting relationship. Her tight-knit inner circle remains a “who’s who” of the creative elite, including Emily Blunt, Alexa Chung, and Sienna’s sister, designer Savannah Miller.