Is Sienna Miller ENGAGED to Lucas Zwirner? Star wears diamond on ring finger

Sienna Miller has sparked speculation she could be set to marry her toyboy boyfriend Lucas Zwirner after stepping out wearing a dazzling diamond on her ring finger.

The Alfie actress, 38, who confirmed her romance with the art gallery owner, 28, in January 2019, was proudly sporting a beautiful silver ring as she made her way around New York City on Thursday.    

Sienna looked effortlessly chic as she was spotted in the Big Apple wearing a pair of orange flared corduroy trousers with a green parka jacket, pink beanie hat and cow print shearling heel boots.  

Engaged? Sienna Miller has sparked speculation she could be set to marry her toyboy boyfriend Lucas Zwirner after stepping out wearing a dazzling diamond on her ring finger

Yet taking centre stage was the new mysterious diamond on Sienna’s ring finger, which she did little to hide on her afternoon stroll. 

Sienna was last seen at the Golden Globes on Sunday night where her ring finger was visibly bare as she walked the star-studded red carpet. 

MailOnline has contacted Sienna’s representative for comment.  

Where’s that diamond come from? The Alfie actress, 38, who confirmed her romance with the toyboy art gallery owner, 28, in January 2019, was proudly sporting a beautiful silver ring as she made her way around New York City on Thursday

The actress went public with her relationship with art gallery owner Lucas a year ago after being introduced through mutual friends. 

Prior to this, Sienna had been engaged to ex Tom Sturridge, 34, whom she split from in 2015 following a four-year romance and the birth of their daughter Marlowe, now seven.

While her most iconic relationship so far has been with her Alfie co-star Jude Law, the former on-off couple got engaged on Christmas Day 2004.

Bare: Sienna was last seen at the Golden Globes on Sunday night where her ring finger was visibly bare as she walked the star-studded red carpet (pictured in NYC, left, on Thursday and at the Golden Globes, right, on Sunday) 

‘Open to marriage’: Only recently, Sienna admitted that she would ‘open to getting married again’ and even having more children as a sibling for her daughter Marlowe (pictured with Lucas in October)  

They later split in 2006 with Jude famously issuing a public apology to her after having an affair with his children’s nanny. 

Sienna and Jude went on to rekindle their romance briefly in 2009 before ending things for good in 2011.

Only recently, Sienna admitted that she would ‘open to getting married again’ and even having more children as a sibling for her daughter Marlowe.

She told The Sunday Times’ Style: ‘Yes, I would love to have more children. I would love a daughter as well. I think I would be open to getting married, yes.’

And speaking about her relationship with art gallery owner Lucas, she added: ‘It is interesting to be in a world that is not the one I am in. I felt like I’d been in every room somehow and the art world is very new and fascinating, and very intellectual, which I love.’

The pair were snapped together in New York before Christmas, enjoying a wintry dog walk.

Although Sienna was born in NY, she was raised in London; but has been spending more time in the Big Apple recently, where Lucas also acts as editorial director to his father’s publishing house, David Zwirner Books.