Sienna Miller, 42, gives a rare insight into motherhood as she reveals her daughter, 11, is ‘very critical’ about her fashion choices

Sienna Miller gave a very rare insight into motherhood when she discussed her daughter being “very critical” of her fashion choices.

The actress, 42, welcomed her second child – first with Oli Green – in January, and also shares 11-year-old daughter Marlowe with ex-partner Tom Sturridge.

Sienna opened up about family life during a candid interview with The guardafter a “rough baby night” with her youngest daughter.

She explained that the 10-year age difference between her daughters is “actually quite convenient, because one is small and portable, and the other is becoming more and more independent.”

Speaking about Marlowe, who walked the Cannes red carpet with her mother earlier this month, Sienna said: ‘She’s so stylish and very critical.’

Sienna Miller gave a very rare insight into motherhood when she discussed her daughter being ‘very critical’ of her fashion choices

The actress, 42, welcomed her second child - first with Oli Green - in January, and also shares 11-year-old daughter Marlowe (pictured) with ex-partner Tom Sturridge

The actress, 42, welcomed her second child – first with Oli Green – in January, and also shares 11-year-old daughter Marlowe (pictured) with ex-partner Tom Sturridge

‘She resembles a young Anna Wintour in her total disregard for some of the things I wear. In New York she found me demeaning. She wished me to brush my hair.”

It comes as Sienna revealed she helped design a 33-piece summer capsule collection with Marks & Spencer’s.

Speaking about the collaboration, Sienna said: ‘I’ve always had a genuine love for M&S – it’s a brand that is part of British life and has a special association for so many people.

‘It was phenomenal to see the response to the autumn campaign I led. Collaborating on a womenswear design project made perfect sense. I’m curious what customers think of the collection.’

Her collection will be launched on Thursday 6 June at M&S.com and in 30 stores.

Sienna is blossoming into motherhood as she stole the show on the red carpet in Cannes last week.

She was promoting her new film: Kevin Costner’s western epic, Horizon: An American Saga.

Her co-star summed her up by saying, “Her outward beauty is undeniable, but she is so skilled as an actress.”

Sienna embraces motherhood again in her early 40s and undergoes 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 Sienna is about to ‘steal the crown of becoming Britain’s biggest Hollywood star’.

It comes as Sienna revealed she helped design a 33-piece summer capsule collection with Marks & Spencer's

It comes as Sienna revealed she helped design a 33-piece summer capsule collection with Marks & Spencer’s

Speaking about the collaboration, Sienna said: 'I've always had a genuine love for M&S - it's a brand that is part of British life and has special associations for so many people.

Speaking about the collaboration, Sienna said: ‘I’ve always had a genuine love for M&S – it’s a brand that is part of British life and has special associations for so many people.

Sienna's fashion sense quickly propelled her to style icon status, ahead of her throwback-worthy appearance at this year's Met Gala (pictured)

She was known for her chic boho style when she first burst onto the scene on the arm of her boyfriend Jude Law;  Pictured at Glastonbury in 2004

Sienna’s fashion sense quickly propelled her to style icon status, ahead of her throwback-worthy performance at this year’s Met Gala (left)

Sienna rose to fame in the early 1990s, when her burgeoning acting career and romance with Jude Law made headlines (pictured with Jude in 2004)

Sienna rose to fame in the early 1990s, when her burgeoning acting career and romance with Jude Law made headlines (pictured with Jude in 2004)

Sienna was supported by family at the Cannes Film Festival and was joined by Oli and daughter Marlowe, 11, at the premiere of her film Horizon: An American Saga in Cannes.

Sienna was supported by family at the Cannes Film Festival and was joined by Oli and daughter Marlowe, 11, at the premiere of her film Horizon: An American Saga in Cannes.

He said: “Sienna has been taking care of herself and getting the red carpet ready knowing this will be her big return to the big screen and knowing all eyes will be on her. She has done everything right and is driving ‘The Croisette’ – the beating heart of Cannes.

Sienna’s breakthrough roles came twenty years ago in Layer Cake and Alfie, but despite critical acclaim for American Sniper, her acting career hasn’t always reached the same heights.

But despite the demands of a red carpet promotional campaign in the south of France this week, she’s back in style. Sienna also brought along her newborn baby and 11-year-old daughter.

It seems Sienna has barely aged a day since her breakout year of 2004. She owes her health and fitness to regular yoga and a taste for protein-packed fried eggs and vitamin-packed Marmite, bucking trends like ‘chia seeds and any grains’ ignores. , Sienna said recently.

But she has admitted she ‘cheated’ by using a bit of fake tan to make her skin glow. Her youthful looks are thanks to regular facials from £400 for 90 minutes and her famous champagne blonde hair highlights cost at least £500.

Experts predict that 2024 will be the year she steps out of the shadows, after years of being overshadowed by boyfriends like Jude Law and Orlando Bloom, as well as 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, are also predicted.

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

Sienna showed off her baby bump in Vogue World in December, before giving birth to a baby girl a month later

Sienna showed off her baby bump in Vogue World in December, before giving birth to a baby girl a month later

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

‘Ms Millar is back at the top of her game, wowing Cannes audiences with her stylistic tailoring, fantastic looks and stunning acting in the new Kevin Costner film Horizon.

‘Sienna has always been a brilliant actress, but it feels like for a while she was bypassed by British stars appearing in The Crown and people didn’t consider Sienna one of our best actresses.

“With this new film and her post-baby glow, she has the world at her feet and with the great reviews she’s getting, I think she’s in for some awards and some solid leading roles in the coming years.

“I see her getting some big brand endorsements too and she’s always loved being on stage, so I wouldn’t be surprised if she decides to do a play on Broadway for a limited run to build her fan base and her acting resume just keeps getting better and better’.