Sienna Miller, 37, cosies up to boyfriend Lucas Zwirner, 28, as they enjoy an ice cream on stroll in NYC

By Rebecca Lawrence For Mailonline

Published: | Updated:

They went public with their romance last year when they …に出席するd?Tom Sturridge's birthday party in London together.?

And Sienna Miller, 37, looked as smitten as ever as she joined?boyfriend Lucas Zwirner, 28, for a romantic stroll around New York City on Monday.?

The pair were seen 軽食ing on ice creams as they enjoyed the unseasonably 穏やかな 天候 whilst cosying up to one another.?

Cute couple:?Sienna Miller, 37, looked as smitten as ever as she joined boyfriend Lucas Zwirner, 28, for a romantic stroll around New York City on Monday

削減（する） couple:?Si enna Miller, 37, looked as smitten as ever as she joined boyfriend Lucas Zwirner, 28, for a romantic stroll around New York City on Monday

Looking effortlessly chic for the 遠出, Sienna donned an oversized beige jumper that she teamed with cropped brown corduroy trousers.?

Putting a typically quirky spin on her ensemble, the fashion icon accessorised with a yellow beret 同様に as cat 注目する，もくろむ shades and gold hoops.?

Sartorially in sync with his girlfriend, Lucas also 選ぶd for a 中立の colour 計画／陰謀 as he teamed a pair of brown slacks with a plum jumper.???

Chic and cheerful:?Looking effortlessly chic for the outing, Sienna donned an oversized beige jumper that she teamed with cropped brown corduroy trousers

Chic and cheerful:?Looking effortlessly chic for the 遠出, Sienna donned an oversized beige jumper that she teamed with cropped brown corduroy trousers

Lucas is a Yale-educated literature buff who joined the family 商売／仕事 to grow his father's eponymous art gallery, David Zwirner 調書をとる／予約するs.

He 現在／一般に 監督するs 25 調書をとる／予約する 解放（する）s a year as 編集（者）の director of the company and 明らかにする／漏らすd he 計画（する）s to 延長する the gallery to publish more than 調書をとる／予約するs.?

Whilst it's not known 正確に／まさに when Sienna and Lucas began dating, he was the 星／主役にする's date when she …に出席するd her ex Tom Sturridge's birthday party last month.

Sienna and Tom co-parent six-year-old daughter Marlowe and have remained on 広大な／多数の／重要な 条件 since their 分裂（する） over three years ago.

Last year, Sienna 噴出するd to Harper's Bazaar that Tom was her 'best friend in the entire world' - and that while they don't 株 a 所有物／資産／財産, they often stay together to spend 相互の time with their little girl.?

Admitting their の近くに 社債 has not broken since they 削減（する） romantic 関係 in the summer of 2015 after four years together, she explained: ‘We still love each other...

'I think in a break-up somebody has to be a little bit cruel in order for it to be 伝統的な, but it’s not been acrimonious in a way where you would choose to not be around that person.'

Former flame:?Last year, Sienna gushed to Harper's Bazaar that her ex Tom Sturridge was her 'best friend in the entire world'? (pictured in 2014)?

Former 炎上:?Last year, Sienna 噴出するd to Harper's Bazaar that her ex Tom Sturridge was her 'best friend in the entire world'? (pictured in 2014)?

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