She is one of Hollywood’s hottest actors who is known for her stunning sense of style.
The Layer Cake actress, 37, was a vision of beauty as she posed with her glamorous, former model mother and celebrated her latest film project.
Sweet: Sienna Miller attended the premiere of her film American Women with her proud mother Josephine by her side at the 45th Deauville American Film Festival on Wednesday
The star slipped into an elegant white and cream floral brocade dress with chic black shoulder straps.
The high neck gown, adorned with delicate floral detail, cinched in at her slender waist before flowing into an elegant ankle-length skirt.
Sienna added a touch of sparkle with a pair of shimmering gold stiletto sandals.
Her platinum tresses were styled sleek and straight while her pretty features were enhanced with feline flicks of liner and a slick of coral lipstick.
Wow: The Layer Cake actress, 37, was a vision of beauty as she celebrated her latest film project
Sienna’s age-defying mother Josephine looked glorious in a black blouse paired with a glittery black jacket.
She teamed this with a floral patterned skirt with semi sheer panels as she supported her daughter.
American Women, in which Sienna stars alongside Christina Hendricks, tells the tale of the disappearance of a woman’s teen daughter in a small Pennsylvania town.
The 32-year-old is left to raise her infant grandson alone, with the story spanning over a total of 11 years.
Lookalikes: Sienna and her age-defying mother Jo looked gorgeous as they posed up a storm
Elegance: The star slipped into an elegant white and cream floral brocade dress with chic black shoulder straps
Meanwhile, on the personal front, Sienna recently made her first public appearance with her new man Lucas Zwirner during their romantic break in Venice.
Their romance has gone from strength to strength since they went public with their relationship in January earlier this year.
Sparks flew when the couple first crossed paths for the first time when they were introduced to each other through mutual friends.
It’s not known exactly when Sienna and Lucas began dating, he was the star’s date when she attended her ex Tom Sturridge’s birthday party last year.
Trophy: Sienna was awarded the Deauville Talent Award trophy during the festival
Wow: Sienna looked gorgeous with a radiant palette of make-up as she posed
Exes Sienna and Tom have remained on good terms as they continued to co-parent their six-year-old daughter Marlowe three years on from their split.
Last year, Sienna gushed to Harper’s Bazaar that Tom was her ‘best friend in the entire world’ and they often stay together to spend mutual time with their little girl.
They first started dating in 2011 but their romance came to an end in 2015 after just four years together.
Sienna also famously dated Jude Law on/off from 2003; the actor issued a public apology to her after having an affair with his children’s nanny.
New film: American Women, in which Sienna stars alongside Christina Hendricks, tells the tale of the disappearance of a woman’s teen daughter in a small Pennsylvania town