Sienna Miller dating Bennett Miller - report

Actress Sienna Miller has reportedly struck up a relationship with her Foxcatcher director Bennett Miller.

The British beauty portrayed Mark Ruffalo's wife in the real-life wrestling crime drama, and it appears her professional relationship with Bennett has since turned romantic.

The pair has been spotted hanging out on numerous occasions in recent months, with reports suggesting they danced together at the Met Gala afterparty in New York in May (16), while the stars were photographed sitting side-by-side at the Wimbledon tennis championships in London in July (16).

They took their rumoured romance back to the Big Apple last Sunday (11Sep16), when they were pictured watching the U.S. Open tennis final between Novak Djokovic and Stan Wawrinka, and Us Weekly reports they are now officially an item.

Representatives for Sienna and Bennett have yet to comment on the claims.

The actress had been dating Tom Sturridge, the father of her four-year-old daughter Marlowe, when she shot Foxcatcher, but they split last summer (15). They have remained friendly for the sake of their little girl and Sienna was snapped reuniting with her ex in New York, where she now lives, earlier this month (Sep16).

Meanwhile, Bennett was previously in a relationship with child star-turned-fashion mogul Ashley Olsen.