"I understand the patriotism of that city, but really I don't think it was that big a deal. I had to meet the mayor live on TV and apologize. It was huge! People are dying in Iraq and where is our focus, d'you know what I mean? Having met me, you'll realize these things just come out. I think it might be mild Tourette's, not to insult people who have proper Tourette's, but I will say the most inappropriate things at the most inappropriate time to the most inappropriate person. Always. Guaranteed."

After questioning her "Shittsburgh" apology to The Guardian, Sienna shared she and her friends renamed other American places.

"Massivetwoshits is Massachusetts. Connecticunt, or Connectibutt. We came up with loads," she says. "But I don't deliberately hurt anybody. And, actually, I like Pittsburgh, I do."

Meanwhile, the maneating actress has sparked outrage among anti-drug campaigners by claiming illegal drugs are "loads of fun".

Miller, 25, "loves" hallucinogenic experiences – describing magic mushrooms as her "drug of choice".

Her remarks came in an interview to promote Factory Girl, in which she plays Andy-Warhol's drug-addicted muse Edie Sedgwick.

Miller said she took a morphine pill "just to feel what a safe way of taking heroin was like. I didn't really feel a lot. I'm hardcore."

She denied her research extended to heroin or Sedgwick's favourite amphetamines but said: "I still love a waterfall (a homemade device for smoking cannabis and other drugs) or the odd hallucinogenic drug.

"If I had a drug of choice, it would be magic mushrooms."

Australia's National Council on Drugs spokesman Gino Vumbaca slammed Miller's comments as irresponsible, saying: "People in a public position, whether they like it or not, represent role models and role models have a duty to those who support them."

In other news, Miller was accompanied by yet another mystery man as she made a trip to stock up on food and booze.

The 25-year-old, who's recently cavorted with Isaac Ferry and Kate Moss's ex Jamie Burke, wore no makeup, scruffy Uggs and a bobble hat reports the 3AM girls.