The film, which is rumoured to contain a steamy threesome involving the two lead actresses, will be directed by John Maybury, who previously directed Keira in The Jacket.

Sienna’s snapper fracas - April 4 2007
A photographer apparently got into a scuffle with members of Sienna Miller’s entourage on Sunday night, as the star strove to avoid being snapped hanging out with Sean ’Diddy’ Combs in London. see photos of P Diddy’s party

The rapper himself was kind and courteous when he left the club where he had been partying with the actress, but the shy starlet attempted to bypass the waiting paps - to no avail.

Instead, in an incident involving two people in her group, one cameraman was allegedly pushed off the pavement as Sienna rushed by on her way into the trendy Soho Hotel.

The snapper in question hasn’t commented on the incident and it’s unlikely to go any further. But the actress’s rep made a statement to TMZ.com about what happened, saying: "It is unfair that the press isn’t courteous in giving her her space. It’s getting uncomfortable for people to walk and London’s a walking city."

Sienna can be seen back on the big screen later this year in fantasy film Stardust, alongside Robert De Niro, Claire Danes and Ricky Gervais.

Sienna: I’m not that kind of actress - Mar 21 2007
Sienna Miller has put an end to rumours that her Factory Girl sex scenes were real.

Even the film’s director George Hickenlooper had refused to deny claims that Sienna and co-star Hayden Christensen had taken their method acting a little further than normally required. But in an interview with New! magazine, the actress dismissed the rumours out of hand.

"There’s a name for people who actually do have sex on film and get paid for it but I’m not that kind of actress, nor is Hayden," the actress said.

"So the sex scene is not real but I’m flattered that people think we did a good enough job that it might be."

Sienna said that there was a great chemistry between all the actors: "It was really fun. I think when there’s chemistry like that, you have such a laugh. We were in this tiny town in Louisiana and the only club was this place called the Rockin Rodeo - it was a hip-hop and line-dancing club with karaoke on Friday nights and we just had a complete giggle. They didn’t know what hit them."

Sienna and Daniel in rom com? - Mar 16 2007
Actress of the moment Sienna Miller and new 007 Daniel Craig might be pairing up again in a new romantic comedy.

The Factory Girl star and Daniel, who appeared together in Layer Cake, are apparently being lined up for a flick based on two British actors who try to make it in Hollywood, the Daily Express reports.

"There are a lot of UK stars who might fit the bill but there are none hotter right now than Sienna and Daniel," a film insider told the paper.

The source added that Sienna and Daniel have "already shown they have chemistry on screen".

The pair were rumoured to be romantically involved after co-starring in 2004 thriller Layer Cake, although Sienna has said they were just friends.

The actress has recently won critical acclaim for her latest role as Andy Warhol’s muse Edie Sedgwick in Factory Girl, which sees her starring opposite former Neighbours star Guy Pearce.

Sienna’s ’green’ claim at premiere - Mar 14 2007
Sienna Miller has said she was doing her best to "go green" by switching off her phone charger and plug sockets and supporting carbon-neutral schemes.