Christopher Nolan delayed filming on 'The Dark Knight Rises' for Marion Cotillard.

The French beauty plays the love interest of Christian Bale's alter-ego, Bruce Wayne/Batman, in the new movie but after Marion discovered filming dates would clash with the birth of her son Marcel, the director adjusted his $250 million production schedule, saying he wanted to ''figure it out''.

Praising the 36-year-old star, Christopher told US Vogue: ''She's Superwoman.''

Although Marion found it difficult to return to work straight after giving birth she is happy she did.

She said: ''I've never been more exhausted. But I've never had more energy. This is the paradox of being happy. That's where it comes from.''

In the movies she plays Miranda Tate - an ecologically-minded businesswoman - who Bruce falls for.

She previously said: ''They go through difficulties, and she wants to help provide the world clean energies. She's a good guy.

''They don't know each other initially, but they meet and kind of understand each other right away. They both have a lot of money and are trying to use it in a good way, but there's also tension between them.''