Sienna Miller is expecting her third child with boyfriend Oli Green, and her red-carpet reveal at the Royal Albert Hall has everyone buzzing. At the 2025 British Fashion Awards, the actress, 43, showed off her baby bump in a sheer white gown paired with white shorts with flowing waves.While the Foxcatcher star's pregnancy is making headlines, curiosity is also swirling around Sienna Miller's net worth, which currently stands at $18 million, thanks to her multi-faceted career in acting, modeling, and fashion.The actress was born on December 8, 1981, in New York City, but grew up in London. She began her career as a model, appearing in Vogue Italy and the Pirelli Calendar.In 2004, she made her breakthrough in acting with the movies Layer Cake (starring Daniel Craig) and Alfie (starring Jude Law). She then portrayed Edie Sedgwick in the biopic Factory Girl in 2006, as well as author Caitlin Macnamara in The Edge of Love in 2008.More films poured in for the actress, such as G.I. Joe: The Rise of Cobra (2009), American Sniper (2014), The Lost City of Z (2016), My Mother's Wedding (2023), and more. She also top-billed several musicals like Cabaret in 2015 and Cat on a Hot Tin Roof in 2017, among others.Throughout her career, Sienna Miller has received several awards and nominations, such as the Best Supporting Actress from the ShoWest Awards for her performance in The Edge of Love; nominations from BAFTA TV Awards, Golden Globe Awards, Satellite Awards, and Critics' Choice Awards for her role in The Girl; and the Film Talent Award from the France American Film Festival Awards and Georgia Film Festival Awards for her role in American Woman.Denis Villeneuve, Mary Parent & Tanya Lapointe Celebrate "Dune: Part Two" in London - Source: GettyIn 2020, Miller was honored with the Television Humanitarian Award by The Creative Coalition for her work as a Global Ambassador for International Medical Corps.Miller is currently a mom of two: a daughter with her current beau, actor-producer Oli Green, and Marlowe, 13, whom she shares with former partner Tom Sturridge.Sienna Miller and Jude Law: A look back at their turbulent romance marked by infidelityApart from her projects and accolades, Sienna Miller's love life has been just as headline-making.In 2004, after co-starring in the romantic-comedy movie Alfie, Jude Law— who was already a father of three at the time — proposed to Miller. However, the couple split in 2006 due to Law's infidelity."American Woman: Fashioning A National Identity" Met Gala - Arrivals - Source: GettyIn 2005, the actor issued a public apology to Sienna Miller for cheating with his kids' nanny. In a statement, he wrote:"Following the reports in today's papers, I just want to say I am deeply ashamed and upset that I've hurt Sienna and the people most close to us. I want to publicly apologise to Sienna and our respective families for the pain that I have caused. There is no defence for my actions, which I sincerely regret, and I ask that you respect our privacy at this very difficult time."Sienna Miller and Jude Law got back together in 2009, giving their romance a second shot. They separated for good in 2011.