Maggie Gyllenhaal was "professionally worried" about starring in the new Batman movie.
The actress - who plays Bruce Wayne's love interest Rachel Dawes in 'The Dark Knight' - was concerned about starring in such a high-budget blockbuster movie.
Maggie - who took over the role from Katie Holmes - said: "I was worried. Professionally and also because I had a three-month-old daughter. The paparazzi were boundary-less, in fact they were awful. I wondered if I really wanted to be in a movie with all that attention.
"Then someone pointed out that I can't hide. If I'm an actress and here's a project with an incredible director and actors, I have to do it."
Maggie, 30, also deliberately tried not to copy Katie's interpretation of Rachel from the previous movie 'Batman Begins'.
She added: "I think Katie is a fine actor, but I don't think it would have served anyone if I were trying to imitate her. I saw Rachel as a new woman in this movie."
Maggie Gyllenhaal's Batman worry
