Sienna Miller may have a new beau in director Bennett Miller

Sienna Miller said she returned to her hometown of New York to escape "cliquey" London, but there may also be a certain someone who played a big factor in her decision. The actress has been spotted getting cozy with her new American beau, Bennett Miller.

Sienna and the director, who worked on Foxcatcher together, were pictured making a cosy appearance at the US Open earlier this week.

The couple sat side-by-side, chatting and giggling as they watched the match. At one point in the competitive game, Sienna grabbed her boyfriend's arm and enthusiastically cheered. Their appearance comes after Sienna, 34, and Bennett, 49, also attended Wimbledon in July.

TAP TO VIEW GALLERYBennet Miller and Sienna Miller sitting at US Open Sienna Miller and Bennett Miller were spotted at the US Open

The couple were first rumoured to be dating in May, after they were spotted at a Met Gala afterparty in New York. Sienna and Bennett hit the dancefloor with ex-couple Taylor Swift and Tom Hiddleston.

At the time a source confirmed they were dating, while an eyewitness told Us Weekly: "[Sienna and Bennett] were together all night."

Bennet Miller and Sienna Miller watching US Open together holding hands The pair worked on 2014's Foxcatcher together

The pair first met a few years ago when Bennett directed Sienna in Foxcatcher in 2014. Sienna was still with her long-term boyfriend Tom Sturridge, with whom she has a four-year-old daughter Marlowe, although they broke up last summer.

Sienna and her daughter have just moved back to the Big Apple. The Alfie actress's sister Savannah shared a snap of her at JFK surrounded by a pile of luggage. Savannah captioned it: "It's official; she's a New Yorker."

Sienna Miller cuddling up to Bennet Miller Sienna recently moved back to her hometown New York

Sienna recently told MailOnline: "London feels cliquey and sometimes a little bit like swimming through mud. I feel like people come to New York to do something. I kind of dine out on that energy. Everyone is here because they're like, 'I have something to say, something to do and I'm going to do it'."

Sienna added: "I find New York, at the moment, a little bit more inspiring."

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