From Helen of Troy to a prisoner of the Taliban

Diane Kruger's big break came opposite Brad Pitt, as the ancient world's pin-up girl, but the polyglot former model's new movie is bang up to date, she tells Kaleem Aftab

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In Special Forces Diane Kruger plays a French journalist kidnapped by the Taliban in Afghanistan. Shot in Tajikistan, the French-language role is another that displays the German star's penchant for changing nationalities, accents and languages. Last time out, in the action thriller Unknown, the 35-year-old played a Bosnian taxi driver. Also on her increasingly illustrious CV are turns as a German actress spying for the British in Quentin Tarantino's Inglourious Basterds, and speaking German in the 2005 First World War hit Joyeux Noel. She played a Chicago resident in Wicker Park and got her big break playing Helen opposite Brad Pitt in Troy.

"I always said that was my big dream as an actor, to be between two chairs," she says about her jump from studio films to more independent fare. "I never wanted to be typecast as a nationality. This does have the result of consistently having to do more work for a role, to be able to speak without an accent in English, to be able to speak with all different kinds of accents playing other nationalities or when I speak in French or German."

There is though, one accent the actress admits that she is afraid to try: "Scottish, oh my god, that would be hard." She adds, in English that betrays no hint of her German roots: "It's all a matter of rehearsal. You can learn any accent you want. It's a fascinating thing." Her skill with accents doesn't extend to impressions, though. "I'm not a very good impersonator, my friends maybe, but not famous people. I can do Karl very well, Karl Lagerfeld, because he speaks the same in every language."

Sadly she doesn't give a rendition of her Lagerfeld but adds: "He's like my stepfather, I love Karl. He's the funniest person I know. He's a big inspiration actually."

Kruger got to know Lagerfeld after she began modelling in Paris, aged 15. Her move to the French capital as a teenager came after a tumultuous couple of years. Born in the tiny hamlet of Algermissen, near Hanover, her parents divorced when she was 13. Her father worked as a cinema projectionist and her mother in a bank. She stayed with her mother, pursuing a career in ballet, but after auditioning for the Royal Ballet in London an injury put paid to her dancing dreams.

After the initial excitement, she found the life of a model "a bit boring" and began to take a more serious interest in acting. Her love-life and career overlapped when in 2001 she married Tell No One actor and director Guillaume Canet and appeared in his directorial debut Mon Idole a year later. The couple divorced in 2006.

The actress now dates Dawson's Creek actor Joshua Jackson. The relationship and a growing interest from Hollywood in her work has led to Kruger spending more and more time in LA, although she still thinks of Paris as her home and it remains her primary base.

Being in California has forced her to get into car culture. Her choice of ride is driven by environmental, not fashionable concerns. "I want to get a hydrogen car that Mercedes are doing. It's an electric car but of course electricity is not necessarily green, especially in America where it's still 60 per cent coal."

To prepare for the role in Special Forces, the actress interviewed journalists who had been in war zones, an "eye-opening" experience. It gave her a greater understanding of, "the lengths journalists will go to relate a story". The filming was far from a usual Hollywood set, with Kruger staying in a traditional yurt rather than a hotel. "I didn't really expect it to be so cold and arduous when I signed on to play the part", she admits.

She has had to do plenty of research for her next, more regal, role, playing Marie Antoinette in Farewell, My Queen. Based on the novel by Chantal Thomas, it follows the relationship between the queen and one of her readers during the final days of the French Revolution. It just finished shooting. "It's directed by Benoît Jacqout and is super intellectual," she admits. "But I'm a little anxious about it because I always feel with those big historical characters you set yourself up for failure because everyone has their opinion on them. The truth is that no one really knows what she is like, and at the end of the day it's up to me and the researcher to decide who she is."

It's a role that the actress feels she was born to play. "I feel like the universe does conspire and I do believe that roles find actors and I have always been fascinated with her from school... [with] what you read about her and myself being German living in France... I've always been aware of her history.

"This part just came to me. I'm the age she was when she died and the movie concentrates on her last four days."