Nicole Kidman is never separated from husband Keith Urban for more than seven days.

The 41-year-old actress - who has a three-month-old daughter Sunday Rose with the country singer - admits the couple have agreed not to be apart from each other for too long, despite their hectic schedules.

She said: "We have a thing where we're not separated for more than seven days. It's not a negotiation. It is such a desire to be together. It's a lovely place to be in a relationship where you just desperately want to be together. We'll do whatever it takes.

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"Keith flew to Australia once for six hours so as not to break the rule, and I said, 'Oh, you don't have to.' He said, 'It's not have to, it's I want to.' That was big - I heard that loud and clear, 'There's no have-to, Nicole.' Which is a lovely thing."

Nicole also revealed what first attracted her to Keith, insisting they became friends before falling in love.

She added to Parade magazine: "Being Australian, both of us. I think that was an immediate rapport. We would have been great friends if we didn't become husband and wife. We were great friends to start. We became really, really close friends. And we just get along. I always said to him, 'You're so easy to live with.' "