Parents to a second daughter ... Nicole Kidman and Keith Urban

Parents to a second daughter ... Nicole Kidman and Keith Urban Photo: Getty Images

After a "roller-coaster ride" with fertility problems, Oscar-winning actress Nicole Kidman says she feels love for the woman who carried her second child.

The 43-year-old Kidman and her husband, country-music singer Keith Urban, surprised the world last month when they announced the arrival of a second baby daughter, Faith Margaret, born on December 28 last year to a "gestational carrier" in the US.

Anyone knows the disappointment, the pain and the loss that you go through trying and struggling with fertility ... [it] is such a big thing 

Kidman, who was present at Faith's birth, said the experience was "deeply emotional, moving".

"Having given birth and then ... seeing my child being born this way, the love I felt for our surrogate... she was the most wonderful woman to do this for us," Kidman told the Nine Network's 60 Minutes program yesterday. (Watch the video).

"We were in a place of desperately wanting another child and this opportunity arose for us and I couldn't get pregnant and we wanted another baby.

"I get emotional even talking about it because I'm so grateful to her.

"Anyone knows the disappointment, the pain and the loss that you go through trying and struggling with fertility ... [it] is such a big thing.

"I've had a roller-coaster ride with fertility."

Kidman conceived with former husband Tom Cruise but suffered an ectopic pregnancy.

Seven years after divorcing Cruise, she gave birth to Sunday Rose with Urban in July 2008.

Kidman and Cruise adopted two children, Isabella and Connor, now aged 18 and 16, who have been introduced to Faith.

The teenagers live in the US with their father and stepmother Katie Holmes.

"It's so different because they don't live with us, but I would love them to come and live with us at some stage," Kidman says.

"They're teenagers, they're in a whole different place."

And while she hasn't ruled out having more children, Kidman suspects Urban has a different perspective on the matter.

"I think if you ask Keith would we have another baby he'd be like, no.

"We love what we have."

AAP