EXCLUSIVE: The unstoppable return of Sienna Miller: How star is ‘ready to be Britain’s biggest Hollywood star’ at 42 – 20 years after first breakthrough roles in Layer Cake and Alfie and just five months after giving birth

Sienna Miller has, at times, been more famous for who she dated than her work as an actress.

But just five months after having a baby, the 42-year-old stole the show on the red carpet in Cannes last night as she promoted her new movie – Kevin Costner’s western epic, Horizon: An American Saga.

Her co-star Costner summed her up yesterday by saying: ‘Her outward beauty is undeniable, but she’s so skilled as an actress.’

Embracing being a mother again in her early forties, Sienna is undergoing a renaissance with fans and commentators declaring that the British actress has ‘never looked better’ despite the demands of work and having a young family.

Brand and Culture Expert Nick Ede told MailOnline that he predicts that Sienna could be about to ‘steal the crown to become the UKs biggest Hollywood star’.

He said: ‘Sienna’s been looking after herself and got herself red carpet ready knowing this is going to be her big return to the big screen and knowing all eyes will be on her. She’s done everything right and she commands The Croisette’ – the beating heart of Cannes.

Sienna’s breakthrough roles came 20 years ago in Layer Cake and Alfie – but despite winning plaudits for American Sniper her acting career hasn’t consistently hit the same heights.

But the 42-year-old is back in the big time despite the demands of a red carpet promotional campaign in the south of France this week, Sienna has also brought her newborn baby and 11-year-daughter with her.

Marlowe Sturridge, daughter of Sienna’s ex-partner Tom Sturridge, also stole the show stood next to her mother and step-father Oli Greene, 27.

But she has confessed to ‘cheating’ by using a little fake tan to make her skin glow, her youthful appearance is down to regular facials starting at £400 for 90 minutes and her famous champagne blonde hair highlights will cost at least £500.

Experts are predicting that 2024 is the year she is stepping out of the shadows having been eclipsed for years by boyfriends such as Jude Law and Orlando Bloom as well as rumoured lovers Leonardo DiCaprio, Daniel Craig and Brad Pitt.

More Hollywood roles in her forties and a run on Broadway in New York, where she lives with her family, is also being predicted.

Nick Ede said that years of being ‘bypassed’ by directors for actresses on shows like The Crown and Downton Abbey may be over.

He said: ‘She has always been someone that has perhaps been more associated with her partners than her work but for once and for all she’s back and stealing the crown to become the UKs biggest Hollywood star.

‘Ms Millar is back at the top of her game and wowing the crowds in Cannes with her stylist clothes, fabulous looks and wonderful acting in the new Kevin Costner movie Horizon.

‘Sienna has always been a brilliant actress but it feels that for a while she was being bypassed by UK stars who appeared in The Crown and people were not considering Sienna as one of our best actresses.

‘With this new movie and her post baby glow she has the world at her feet and with the great reviews she’s receiving I think she will be up for awards and be offered some meaty starring roles in the next few years.

‘I can see her getting some big brand endorsements too and she’s always loved treading the boards so I wouldn’t be surprised if she decided to do a play on Broadway for a limited run to build her fanbase and her acting resume just gets better and better’.

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EXCLUSIVEThe unstoppable return of Sienna Miller: How star is ‘ready to be Britain’s biggest Hollywood star’ at 42 – 20 years after first breakthrough roles in Layer Cake and Alfie and just five months after giving birth
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By Martin Robinson, Chief Reporter
Sienna Miller has, at times, been more famous for who she dated than her work as an actress.

But just five months after having a baby, the 42-year-old stole the show on the red carpet in Cannes last night as she promoted her new movie – Kevin Costner’s western epic, Horizon: An American Saga.

Her co-star Costner summed her up yesterday by saying: ‘Her outward beauty is undeniable, but she’s so skilled as an actress.’

Embracing being a mother again in her early forties, Sienna is undergoing a renaissance with fans and commentators declaring that the British actress has ‘never looked better’ despite the demands of work and having a young family.

Brand and Culture Expert Nick Ede told MailOnline that he predicts that Sienna could be about to ‘steal the crown to become the UKs biggest Hollywood star’.

He said: ‘Sienna’s been looking after herself and got herself red carpet ready knowing this is going to be her big return to the big screen and knowing all eyes will be on her. She’s done everything right and she commands The Croisette’ – the beating heart of Cannes.

Sienna’s breakthrough roles came 20 years ago in Layer Cake and Alfie – but despite winning plaudits for American Sniper her acting career hasn’t consistently hit the same heights.

But the 42-year-old is back in the big time despite the demands of a red carpet promotional campaign in the south of France this week, Sienna has also brought her newborn baby and 11-year-daughter with her.

Marlowe Sturridge, daughter of Sienna’s ex-partner Tom Sturridge, also stole the show stood next to her mother and step-father Oli Greene, 27.

Sienna Miller in Cannes yesterday – just five months after giving birth
Sienna showed off her baby bump at the Vogue World in December, before giving birth a month later to a baby girl
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Sienna showed off her baby bump at the Vogue World in December, before giving birth a month later to a baby girl
Sienna with former fiance Jude Law
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View gallery
Sienna with former fiance Jude Law
Sienna with and ex Daniel Craig in 2004 – the year Layer Cake was released
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Sienna with and ex Daniel Craig in 2004 – the year Layer Cake was released
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Sienna looks to have barely aged a day since breakthrough year of 2004. She has put her health and fitness down to regular yoga and a love of protein-rich fried eggs and vitamin-laden Marmite – ignoring trends like ‘chia seed and whatever grains’, Sienna said recently.

READ MORE: How Kevin Costner keeps those cowboyish good looks! Star, 69, says he’s ‘never felt the need’ for plastic surgery and credits his physique to running around after his kids
The actor is pictured while taking to the red carpet at Cannes Film Festival yesterday, for the premier of his movie Horizon: An American Saga’
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View gallery
The actor is pictured while taking to the red carpet at Cannes Film Festival yesterday, for the premier of his movie Horizon: An American Saga’

But she has confessed to ‘cheating’ by using a little fake tan to make her skin glow, her youthful appearance is down to regular facials starting at £400 for 90 minutes and her famous champagne blonde hair highlights will cost at least £500.

Experts are predicting that 2024 is the year she is stepping out of the shadows having been eclipsed for years by boyfriends such as Jude Law and Orlando Bloom as well as rumoured lovers Leonardo DiCaprio, Daniel Craig and Brad Pitt.

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More Hollywood roles in her forties and a run on Broadway in New York, where she lives with her family, is also being predicted.

Nick Ede said that years of being ‘bypassed’ by directors for actresses on shows like The Crown and Downton Abbey may be over.

He said: ‘She has always been someone that has perhaps been more associated with her partners than her work but for once and for all she’s back and stealing the crown to become the UKs biggest Hollywood star.

‘Ms Millar is back at the top of her game and wowing the crowds in Cannes with her stylist clothes, fabulous looks and wonderful acting in the new Kevin Costner movie Horizon.

‘Sienna has always been a brilliant actress but it feels that for a while she was being bypassed by UK stars who appeared in The Crown and people were not considering Sienna as one of our best actresses.

‘With this new movie and her post baby glow she has the world at her feet and with the great reviews she’s receiving I think she will be up for awards and be offered some meaty starring roles in the next few years.

‘I can see her getting some big brand endorsements too and she’s always loved treading the boards so I wouldn’t be surprised if she decided to do a play on Broadway for a limited run to build her fanbase and her acting resume just gets better and better’.

Sienna Miller (pictured yesterday) appears in both parts of Costner’s western epic, filming some of it while pregnant last year

Sienna Miller (pictured yesterday) appears in both parts of Costner’s western epic, filming some of it while pregnant last year
British actress Miller, 42, said that she would go ‘to the ends of the earth’ for Costner. He said of her: ‘I think she’s one of our great actresses. Her outward beauty is undeniable, but she’s so skilled as an actress.

British actress Miller, 42, said that she would go ‘to the ends of the earth’ for Costner. He said of her: ‘I think she’s one of our great actresses. Her outward beauty is undeniable, but she’s so skilled as an actress’
Sienna Miller attends The 2024 Met Gala two weeks age.

Sienna Miller attends The 2024 Met Gala two weeks ago
Sienna Miller, 42, reflected on bizarre pregnancy cravings as she detailed ‘indulgent’ babymoon at a celebrity hotspot in the Maldives last year (pictured in St Tropez in August)

Sienna Miller, 42, reflected on bizarre pregnancy cravings as she detailed ‘indulgent’ babymoon at a celebrity hotspot in the Maldives last year (pictured in St Tropez in August)
The actress, 42, welcomed her second child – and first with Oli Green- in January, a baby girl whose name they have not revealed (pictured in October)

The actress, 42, welcomed her second child – and first with Oli Green- in January, a baby girl whose name they have not revealed (pictured in October)
The actress has barely aged a day since starring in Layer Cake and Alfie more than twenty years ago (pictured in Layer Cake in 2004)

The actress has barely aged a day since starring in Layer Cake and Alfie more than twenty years ago (pictured in Layer Cake in 2004)
The actress has barely aged a day since starring in Layer Cake and Alfie more than twenty years ago.

READ MORE: Kevin Costner’s Horizon epic slammed by critics on Rotten Tomatoes and receives scathing reviews despite 10 minute standing ovation at Cannes
Kevin Costner’s Horizon epic has been slammed by critics on Rotten Tomatoes and received scathing reviews despite getting a 10 minute standing ovation at
Kevin Costner’s Horizon epic has been slammed by critics on Rotten Tomatoes and received scathing reviews despite getting a 10 minute standing ovation at Cannes

The actress, who lives in New York, has said that she is more yoga girl than spinning class field.

She said recently: ‘Cooking is a focus for me. But I wouldn’t say healthy … I’m more of a home cook: roasts, some Asian food, pastas and sauces and soups. In terms of, like, chia seed and whatever grains, no. I’m like, ‘Fried eggs and Marmite toast’.’

Sienna was on the red carpet with Kevin Costner in Cannes to promote his Western opus Horizon over the weekend.

The film has received mixed early reviews – but it marks a significant big screen return for Sienna.

Kevin’s made the first two film instalments which will both be out this year, and is now editing the third and fourth – and he he has financed it himself.

Co-star Sienna was in Cannes to share the spotlight with recently-divorced Costner, who said: ‘I’m financing this and doing a lot of this myself.

‘It was just going to be me and Sienna Miller, and then I got to thinking about it and I thought: I’m going to bring all the women [in the film]. I sent an email to all the guys: that I’m taking six girls. They’re never celebrated enough.’

Sienna has found love with actor and model Oli Green.

The Layer Cake star is already mother to daughter Marlowe, ten, with her ex Tom Sturridge.

Now she has a baby with Oli, born in January,

Discussing her relationship with Oli, who is 15 years her junior, Sienna told British Vogue previously: ‘There’s a misogyny that is ingrained in men of my age and older that I don’t see in [the] generation.