The couple share two daughters, Sunday Rose, 10 and Faith Margaret, eight.
The 51-year-old revealed that her house is always a busy one.
'Our house is always full of kids,' she revealed. 'Sometimes we have eight kids over for dinner after school.'
The actress recently reflected on her love affair with Urban.
“It was my [38th] birthday, and he stood outside with gardenias at 5 a.m. on my stoop in New York,” Nicole told People.
“That is when I went, ‘This is the man I hope I get to marry.'”
Keith went on to take Nicole to Woodstock – the site of the 1969 music festival – for a romantic getaway.
And the pair never looked back.
“It was pretty intense,” Nicole reflects.
“I believed by that point he was the love of my life. Maybe that’s because I am deeply romantic, or I’m an actress, or I have strong faith as well, but I just believed, ‘Oh, okay, here he is.'”