Nicole Kidman thinks her new movie 'Rabbit Hole' has a "hopeful" message.

The 'Australia' actress and co-star Aaron Eckhart portray a couple who struggle to cope with the death of their son in a road accident in the big-screen adaptation of stage play 'Rabbit Hole' as but Nicole is adamant the film is not completely heartbreaking.

She told US TV talk show host Conan O'Brien: "I actually think it's very hopeful. It shows what happens when people go through an enormous loss and it shows that you can stay together. It's about a family and how it copes with this.

"It deals with many other things too. I say it's a small film but it actually does deal with a lot of issues."

Nicole revealed she decided to become a producer on the film because she was so passionate about getting it made.

She said: "I produced it which was a great thing to do because it so hard to get it made because it's such difficult subject matter. It's such a beautiful film, it's real."

The film - directed by 'Hedwig and the Angry Inch' filmmaker John Cameron Mitchell - deals with how the couple cope after the driver of the car that killed their child contacts them seeking closure from the incident.