The 48-year-old actress has two daughters, Sunday Rose, seven and four-year-old Faith, with her country music star husband, who she married in 2006.
Kidman said she if she had two more children with Urban, 47, it would have been "glorious," reported Female First.
"I wish I could have met him much earlier and had way more children with him. But I didn't. I mean, if I could have had two more children with him, that would have been just glorious. But as Keith says, 'The wanting mind, Nicole. Shut it down.'"
The children have been raised as Scientologists like their father and she is believed to have little contact with them.