Speaking to HELLO! at the London premiere last week, the star described the film, which she also co-produced, as "the biggest achievement in my working life so far". She plays the title character, "an unbelievably courageous, flawed middleaged woman, who got her US war accreditation and went to the front line".
The 48-year-old actress was joined by her on-screen husband Alexander Skarsgard, with the actor, who plays British surrealist artist Roland Penrose, matching Kate's chic black gown with a dapper suit.
The pair had an undeniable off-screen rapport: at one point, he leant over to kiss her while they spoke to the press.
Alexander, also 48, said his favourite moment on set came shooting early scenes with Kate in the South of France.
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THROWING IT BACK TO THE 1990S 'VOGUE' ERA OF THE SUPERMODEL
KATE MOSS LEADS FAMOUS FACES REFLECTING ON FASHION HEYDAY
FORMER 'MADE IN CHELSEA' STAR FRAN NEWMAN-YOUNG
DAZZLES IN BESPOKE WEDDING GOWN AS SHE TIES THE KNOT IN STYLE IN MAJORCA
LENDING SUPPORT TO CHILDREN'S HOSPICE PRINCESSES BEATRICE AND EUGENIE
BRING LIGHT INTO LITTLE ONES' LIVES AS THEY PLANT A SYMBOL OF HOPE
ON BUOYANT FORM AFTER HIS WIFE'S GOOD NEWS THE PRINCE OF WALES
DISHES OUT THE HUGS ON VISIT FROM THE HEART
WITH AN INCREDIBLE GLIMPSE INTO FAMILY LIFE THE PRINCESS OF WALES
SHARES MESSAGE OF HOPE AS SHE LOOKS TO THE FUTURE AND BALANCING HER ROLE
IN HIGH SPIRITS AT THE BRAEMAR HIGHLAND GAMES THE KING AND QUEEN
ENJOY LAUGHS APLENTY AT A FAVOURITE EVENT BEFORE MONARCH QUIETLY MARKS TWO YEARS ON THE THRONE
AS HOLLY WILLOUGHBY RETURNS NATIONAL TELEVISION AWARDS
STARS DAZZLE ON NIGHT OF GLAMOUR AND GONGS
CREATING A NEW SISTER ACT ELIZABETH OLSEN
ON CO-STARRING WITH NATASHA LYONNE AND CARRIE COON
MAKING HISTORY AT STARSTUDDED EVENT IN NEW YORK TAYLOR SWIFT
SMASHES IT WITH SEVEN OF THE BEST AT THE V.M.As
KIM KARDASHIAN AND DAKOTA JOHNSONS
FASHION AND COMPASSION AT A-LIST CHARITY EVENT