Sienna Miller and reported fiancé split after a year together

Sienna Miller and her rumored fiancé Lucas Zwirner have call it quits, a new report claims.

© Dave Benett/Getty Images Lucas Zwirner and Sienna Miller

Page Six reported the split news, but didn't give a reason for the parting. 

The actress and Lucas, an art gallery executive, never confirmed their engagement, but a source said he popped the question last January.  Shortly after, Sienna was seen wearing what appeared to be an engagement ring. She was also photographed wearing the same ring in July.

The couple dated for a year, but things weren't necessarily always on the up and up. In fact, Page Six reported that the duo "previously hit a rough patch before they purportedly got engaged."

While the exact timing of the split isn't publicly known, Sienna and Lucas were last pictured together running errands in July.

© MCPIX/Shutterstock Sienna Miller and Lucas Zwirner

During the romance, the couple attended several high-profile events together, including Ellie Goulding and Caspar Jopling's wedding and a pre-Met Gala event. During that time they were "clearly deeply smitten," Page Six noted. 

Sienna has previously been engaged to Jude Law and Tom Sturridge.