Nicole Kidman arrives at the 53rd annual Grammy Awards on...

Nicole Kidman arrives at the 53rd annual Grammy Awards on Sunday, Feb. 13, 2011, in Los Angeles. (AP Photo/Chris Pizzello) Credit: AP Photo/Chris Pizzello

Nicole Kidman opened up on Australia's "60 Minutes" news program about the birth of her and husband Keith Urban's second daughter, Faith Margaret, two months ago via gestational carrier.

"If it's your biological child, then you use [the phrase] 'gestational carrier,' and if it isn't, then you use 'surrogate,' " she told interviewer Karl Stefanovic at the Beverly Hills Hotel in Los Angeles. "I couldn't get pregnant and we wanted another baby," Kidman, 43, explained. "[W]e were in a place of desperately wanting another child and this opportunity arose for us."

Tearing up, she called the carrier "the most wonderful woman to do this for us. . . . I get emotional just talking about it, 'cause I'm so grateful to her."

Kidman - who with first husband Tom Cruise adopted son Connor, now 15, and daughter Isabella, 18 - gave birth to daughter Sunday Rose in 2008.

"I've had a very roller-coaster ride with fertility," she said. "I just have, and it has never been easy for me."

She was present at Faith's birth, and said the maternal bond is equally strong toward all her children. "[I]t's the same when your children are adopted as well. I think children are children. You'll die for your children and when you feel that as a parent, I mean, that's the unconditional love. . . . Until you feel it, you can't quite grasp it."

Her older two, she said, "don't live with us," having chosen to stay with Cruise, "but I would love them to come and live with us at some stage. . . . They're teenagers," she added philosophically. "They're in a whole different place."

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