Sienna Miller splits with fiancee Lucas Zwirner nine months after he proposed ...

Actress Sienna Miller has split from her third fiancé, Lucas Zwirner.

Sienna, 38, and Lucas, 29, the son of art dealer David Zwirner, were engaged back in January after a year of dating, but Page Six reports they have split.

The report claims that it was the actress who broke it off with Zwirner, though no reason for the break-up was given. 

Split: Actress Sienna Miller is living the single life again, after splitting with her fiance Lucas Zwirner

Split: Actress Sienna Miller is living the single life again, after splitting with her fiance Lucas Zwirner

No response: Reps for both Miller and Zwirner's art gallery he runs in New York City did not respond to requests for comment

No response: Reps for both Miller and Zwirner's art gallery he runs in New York City did not respond to requests for comment

Reps for both Miller and Zwirner's art gallery he runs in New York City did not respond to requests for comment.

The couple had reportedly been dating for over a year when Zwirner popped the question back in January.

They were spotted at the Sundance Film Festival in January for the premiere of Miller's film Wander Darkly, where the actress was seen sporting what was believed to be an engagement ring.

Still, while Miller was spotted with the ring elsewhere, neither she nor Zwirner confirmed the engagement publicly. 

Ex: Sienna also dated actor Tom Sturridge from 2011 until 2015, becoming engaged in 2012 - the pair share eight-year-old daughter Marlowe Ottoline Layng (pictured together in 2013)

Ex: Sienna also dated actor Tom Sturridge from 2011 until 2015, becoming engaged in 2012 - the pair share eight-year-old daughter Marlowe Ottoline Layng (pictured together in 2013)

Famous ex: Sienna was also engaged to her Alfie co-star Jude Law, who were in an on and off relationship until they split for good in 2011 (pictured in 2004)

Famous ex: Sienna was also engaged to her Alfie co-star Jude Law, who were in an on and off relationship until they split for good in 2011 (pictured in 2004)

Sienna was spotted in paparazzi photos seen wearing the ring as recently as July, and they were spotted that month running errands together.

Sources also claimed that the pair had hit a 'rough patch' in their relationship just before Zwirner proposed in January. 

Last year they were photographed at a pre-Met Gala dinner party in May, one of many New York City functions they were spotted together at.

They also

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