"I didn't grow up with any girls in my family, it was just my brother and me and mum and dad. Now being in a family that is all girls, I'm learning an enormous amount," Urban, 47, said.
Married in 2006, Urban and Kidman, 47, have found their parenting styles mesh as their relationship evolved, reported Us magazine.
"Nic (Nicole) and I are very in sync with the way we want to raise our girls. (We maintain) a very expressive, artistic house. I'm very comfortable with it," said Urban, who married Kidman after less than one month together.