The `Unknown` actress - who has been in a relationship with actor Joshua Jackson for four years - prefers to dress down when she isn`t working, and so people never realise she is a famous movie star.
She said: "Do I get recognised? Not really because I`m not usually made-up.
"My house in Paris is next door to a university and people think I work there. They constantly ask me directions,`Where`s room 405?` And I`m like, `I really don`t know!` "
The 34-year-old former model also admitted she doesn`t think looks are important in Hollywood.
She explained to Stylist magazine: "I think I learned very quickly that it doesn`t really matter what you look like. Obviously it`s Hollywood and you get your foot in if you look a certain way, let`s not kid ourselves, but there are a lot of beautiful people in the world."The German star went on to say that an actor`s success comes not from how they look but what they bring to the screen - and that the "most beautiful" people are those who portray their roles most convincingly.
She said: "It`s about the journey and the emotional intensity you bring to the screen or the part that makes a character alive. Even if you`re the most unattractive, by giving a performance that is emotional you become, on screen, literally the most beautiful person."