Nicole Kidman on life and new film 'Rabbit Hole'

Oscar winning actress Nicole Kidman, who made her producing debut in Rabbit Hole, has spoken candidly about the film, her family and being a mother.

The Australian actress, who lives in Nashville with her country star husband Keith Urban and their daughter Sunday Rose, has already received acclaim for her role in the film, where she plays a mother struggling to cope with the death of her child, and picked up a Golden Globe nomination for it.

In an exclusive interview with the Sydney Morning Herald, Kidman said she had been nurturing Rabbit Hole from the start.

Her reaction after reading a New York Times review of the Pulitzer Prize-winning play by David Lindsay-Abaire, was 'Gosh, that sounds like rich material'.

She said she was quick to hop into the role of Becca.

"When we first optioned the play, I wasn't pregnant. This has been years in the making, so there wasn't a thought of being pregnant. I thought I'd never get pregnant. But I get what she goes through. I get her relationship with her mother, her sister, God. I get the way in which she is so angry," the 43-year-old actress said.

"I read stuff. I tried to go to a grief group but I was told 'No, you're not allowed. You can only step into these rooms if you lost a child.' I totally get it, yet for whatever reason, that rawness was available to me. Maybe it was from giving birth (to daughter Sunday Rose) 11 months prior," she said when asked how she prepared to play a woman who goes through something no parent should ever have to face.

Kidman revealed that she and Urban try to never be separated from their daughter for too long.

"Time is the most precious thing. I'm very particular about how I spend it. I'm more reluctant to leave my family. Keith and I are very tight, and we're never separated. If we are, it's no more than three days," she said.

The actress said that the couple's two-and-a-half year-old daughter Rose was virtually into everything.

"She's into this, she's into that. She's just really hard to wrangle at this stage," she said.

She also said that the couple has not ruled out the possibility of expanding their family.

"We're hoping for another one," she said.