Sienna Miller cuts a stylish figure in a green sweater and high-waisted baggy jeans in New York

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Sienna Miller cuts a stylish figure in a green sweater and high-waisted baggy jeans as she strolls in New York

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Sienna Miller looked effortlessly stylish as she stepped out in New York City on Tuesday.

The actress, 40, looked tense in high-waisted jeans and a green sweater during her walk.

The Anatomy of a Scandal star, who is in a relationship with actor Oli Green, 25, is based between both the UK and US

Effortlessly chic: Sienna Miller cut a stylish figure in a green sweater and high-waisted baggy jeans as she went out for a walk in New York on Tuesday

Effortlessly chic: Sienna Miller cut a stylish figure in a green sweater and high-waisted baggy jeans as she went out for a walk in New York on Tuesday

Sienna wore a white T-shirt under her woolly sweater and wore a leather belt and long gray socks as accessories.

She paired the look with a pair of red fluffy Rag and Bone flip flops and a red leather look handbag.

Sienna, who recently dyed her blonde locks red, wore her hair out and around her face and vintage-looking silver sunglasses.

Stylish: Sienna wore a white T-shirt under her woolly sweater and wore a leather belt and long gray socks as an accessory

Stylish: Sienna wore a white T-shirt under her woolly sweater and wore a leather belt and long gray socks as an accessory

Stylish: Sienna wore a white T-shirt under her woolly sweater and wore a leather belt and long gray socks as an accessory

She carried a book in her hands and seemed relaxed as she stepped outside.

Sienna is currently dating toyboy model Oli Green, 25, who is 15 years her junior.

It comes after her boyfriend Poppy Delevingne gave fans a glimpse of their summer last week, posting a series of photos from the Glastonbury festival in June, including sweet shots of Sienna and her boyfriend Oli.

They first got out with the Burberry model in February at a New York Knicks game, confirming their romance.

Rising star Oli was the face of a Burberry 2018 campaign and has also modeled for high street retailer GAP.

Although he is also an actor and comes from one of the most prestigious families of the British art world – as his grandfather Richard Green owns two galleries in Mayfair.

Cute couple: Sienna is currently dating toyboy model Oli Green, 25, who is 15 years her junior.  Pictured in Glatsonbury

Cute couple: Sienna is currently dating toyboy model Oli Green, 25, who is 15 years her junior.  Pictured in Glatsonbury

Cute couple: Sienna is currently dating toyboy model Oli Green, 25, who is 15 years her junior. Pictured in Glatsonbury

Pucker up: The star enjoyed the huge music bash with her boyfriend Oli Green, 25, with the pair even partying alongside her ex Tom Sturridge and his newfound love Alexa Chung (Tom and Alexa pictured)

Pucker up: The star enjoyed the huge music bash with her boyfriend Oli Green, 25, with the pair even partying alongside her ex Tom Sturridge and his newfound love Alexa Chung (Tom and Alexa pictured)

Pucker up: The star enjoyed the huge music bash with her boyfriend Oli Green, 25, with the pair even partying alongside her ex Tom Sturridge and his newfound love Alexa Chung (Tom and Alexa pictured)

Sienna and ex Tom Sturridge dated from 2011 to 2015 and they share nine-year-old daughter Marlowe Ottoline Layng Sturridge.

The British-American beauty has spoken openly about her “unconventional” relationship with the Being Julia actor in the past.

About co-parenting, she told Elle UK in 2019: ‘It’s not like there’s any structure to custody. We make it work. It’s not conventional.’

Sienna previously told Harper’s Bazaar that Tom was her “best friend in the whole world” – and that although they don’t share property, they often stay together to spend time with their little girl.

Admitting that their close bond hasn’t broken since they broke up romantically in the summer of 2015 after four years together, she explained, “We still love each other.”

Best friends: Sienna and Tom dated from 2011 to 2015 and they share nine-year-old daughter Marlowe Ottoline Layng Sturridge (pictured in 2014)

Best friends: Sienna and Tom dated from 2011 to 2015 and they share nine-year-old daughter Marlowe Ottoline Layng Sturridge (pictured in 2014)

Best friends: Sienna and Tom dated from 2011 to 2015 and they share nine-year-old daughter Marlowe Ottoline Layng Sturridge (pictured in 2014)