Oscar push for Sienna in Warhol film

"I'll be an independent girl," the actress told me, agreeing she needed a place separate from whoever may be sharing her life.

The move to her own property will be delayed, though, till after she completes her latest picture, The Mysteries Of Pittsburgh, her fifth movie this year, later next month.

But then she has to finish post-production work on another film, Factory Girl, about tragic style icon Edie Sedgwick and her relationship with Andy Warhol.

The small-budget independent picture could become an important boost to Sienna's acting career. Those who have seen early rough-cut versions tell me the performances of Sienna and leading man Guy Pearce, as Warhol, are brilliant. So much so that studio chief Harvey Weinstein plans a year end Oscar campaign for them.

By that time, Sienna hopes to be ensconced in her new home. "When I was last in London, I was feeling like I should be back in a hotel room, and that's when you know it's time to stop for a little bit," she said.

Certainly, playing Edie Sedgwick took its toll. "The more I delved into her, the more I realised she'd had this traumatic life," Sienna, left as Sedgwick, told me, explaining how her childhood was an emotional nightmare.

She was popping Valium at eight, had electric shock treatment at 14, and was sexually abused by her father. "You can see why she went so wild," Sienna noted, alluding to Sedgwick's s society antics in Sixties New York.

The actresss, 24, was fascinated by Sedgwick, spending the best part of a yea ar researching her life, and ad dmits she became "totally obssessed" with the model-turned-muse.

"I found it really hard to take my black tigghts off," she joked, referring to Sedgwick's trademark nylons But then, more seriously, she added: "Actually, I didn't want to let her go."

Finally, though, Sienna's mother told her to pull herself together. "She said: 'You've got to stop this now.' I took myself off to Mexico co on my own for a week and just chilled out, but it was several more weeks before Edie escaped my system. I think there's still aa bit of her in me."

Sienna has s been a busy girl. Other movies she's shot this year, in addition to Factory Girl and The Mysteries Of Pittsburgh, include Interview, Camille and Matthew Vaughn's Stardust.

Interestingly, none of them features Jude Law, although the two did spend time together at the Toronto International Film Festival recently.

Read more Baz online at bazblog.dailymail.co.uk