The 40-year-old star, who has an adopted daughter Bella, 15 and 12-year-old son Conor with former husband Tom Cruise, recently spoke of her hopes having a baby with Urban.

Nicole and Jennifer Jason Leigh on the cover of 'Interview' magazine

In a recent interview with Vanity Fair, in which she revealed she suffer a miscarriage at 23, Kidman said: "I'm yearning to have one. I think I would be very sad if I wasn't able to have a baby.

"Keith knows I want one, and he has been getting there slowly. My husband really wants a couple of years, he said, 'Where I just have you.' So it's kind of romantic. That's what we decided."

Meanwhile, the slender Australian star is bulking up for her new silver screen role in The Reader.

She has already put on 10lb and is planning to double her weight gain in the coming weeks, according to sources.

A movie insider reveals: "The part she plays demands that she gets fatter throughout the movie as her character slips into middle age."

Second time round for Nicole: Marrying Keith in Sydney

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