She gave birth to her first biological child, Sunday Rose (or Roast), when she was 40 years old with husband singer Keith Urban.
She already had two adopted kids Isabella and Connor with ex-husband Tom Cruise.
In a previous interview, she talks about having a child after 40:
"I raised two kids when I was in my 20s, but that was a different thing. I was a kid and still so young mentally and emotionally — a totally different mom. There is something about mothering late in life. A lot of it is I want to stay alive for Sunday. There is plenty of deep fear and emotion. Sunday has healed an enormous amount in me. It's a very private thing, but she just has."
Faith Margaret, Kidman's second daughter with husband Keith Urban, arrived via gestational surrogate in 2012.