Sienna Miller's secret affair with married man

Sienna Miller has been spotted out and about in LA with married actor Balthazar Getty.

Just weeks after splitting with boyfriend Rhys Ifans, the Alfie star has been photographed in Hollywood this week with 33-year-old Balthazar, an oil heir-turned-actor.

She parted ways with Welsh actor Ifans earlier this month, amid rumours he was becoming too possessive over her, despite whispers of a possible marriage.]

Miller has said to have been introduced to the Getty through her Edge Of Love co-star and Getty's Brothers and Sisters castmate Matthew Rhys.

A source told the News Of The World, "They went to great pains to find a place where they thought nobody would find them.

"They daren't go out together, so they spend most of their time inside. When they do leave, they go separately."

Meanwhile, Getty's fashion designer wife Rosetta Millington has fled the U.S., taking their four children - the youngest born just eight months ago - to Italy, according to The News of the World.

Five Fun Facts

1、Sienna Miller was almost born in a theater. Her mother, former model Josephine Miller, went into labor while watching the Nutcracker Suite in New York City in 1981.

2、Sienna Miller, who went topless in a 2003 Pirelli Calendar, in 2004's Alfie and the March 2006 issue of Vanity Fair, told London's The Times, "As an actress I feel that if you start to impose your own inhibitions, then you are not doing your job. And I'm fascinated by people who are extroverted, so I guess I've got a lot more nudity to come."

3、Sienna Miller doesn't own a hairbrush.

4、In February 2005, Sienna Miller bought more than $13,000 worth of photographs of Edie Sedgwick, whom she portrayed in the biopic Factory Girl.

5、"I'm quite looking forward to the day when our paths will cross, which I know they will," Sienna Miller says of the former nanny who had an affair with her then-love Jude Law, in the February 2006 issue of Interview. "She better live in fear. I just hope she doesn't run into me in a dark alley."

Sienna Miller 'Not This Tragic Figure' After Breakup

Sienna Miller is holding up after the widely reported break-up with her boyfriend, Welsh actor Rhys Ifans.

Her life, she tells London's The Times while promoting her new movie The Edge of Love, is "exquisite. I'm not victimizing myself, I'm not this tragic figure."

"My life is privileged," says Miller, 26. "And it's exactly where I'm supposed to be. I make decisions. I take responsibility for them."

One recent decision: to sell the Central London home she shared with Ifans, 39, best known for his role as Hugh Grant's eccentric roommate in 1999's Notting Hill. "

I want to sell that house," she says. "I don't like it any more. I'm over it."

What is difficult is escaping the news of her breakup. "It's everywhere," she says. "I try not to read it, but it's hard not to. I don't want to go, 'Woe is me in suffering', but it's not easy for me."

When it comes to settling down, Miller has admitted that she "chops and changes." She admits to sexual experimentation with other girls as a teen while away from home at Heathfield boarding school in Ascot. "

It was a great school, and it made me learn how to share and to understand women," Miller says. "We'd have the odd snog together. It wasn't all the time, but, you know, who hasn't dabbled?"

Sienna Miller Remembers Heath Ledger – with Pajamas

Sienna Miller says a pair of pajamas she shared with Heath Ledger, who died in January, helps keep her Casanova costar alive in her heart. "

Heath and I had this amazing night out in Venice with my mother," Miller tells June 7 issue of Britain's Telegraph Magazine, recalling working on their 2005 movie. "It had been pouring with rain. Heath ran out in the middle of St. Mark's square and we were running around, and I slipped over." "

We all ran back to his [apartment] and he gave me these dry pajamas to get home in," Miller says.

Two years later, Miller had the chance to return the favor to Ledger, who often talked about his trouble getting a good night of sleep."

When he came over to my house last November, and he was having trouble sleeping, I gave them back, to help him sleep," she says.

To Miller, the PJs became a symbol of her friendship with Ledger. "When he died, I was so sad that I didn't have these stupid pajamas anymore, so his father found them to give to me."

Miller keeps the blue checked sleepwear close, and had them with her in Prague during the filming of her upcoming movie, G.I. Joe, the magazine reports.

Sienna Miller to Star in New Twist on Robin Hood

Get out the tights: Sienna Millr is set to play Maid Marian alongside Russell Crowe's Sheriff of Nottingham in an upcoming, revisionist view of Robin Hood, to be directed by Crowe's Gladiator collaborator Ridley Scott, the actress has confirmed. "

I just found out," Miller, 26, tells the BBC. "It's the most exciting news in the world."

This isn't any old Robin romp: This time in Sherwood Forrest, the usually villainous sheriff is due to be portrayed as heroic, while Robin – traditionally known for nobly stealing from the rich to give to the poor – is not.

In April, Variety reported that the movie, titled Nottingham, would be produced by A Beautiful Mind's Brian Grazer and released by Universal.

Despite the looming threat of an actors' strike, the production, from a script by Oscar-winning L.A. Confidential screenwriter Brian Helgeland, is "looking pretty certain," says Miller, 26.

Casting for the Hood has yet to be announced.

As for her role – in the past, Robin always had a thing for Marian – Miller says she "could not have a better part," while teaming with Crowe and Scott was "as good as it gets."