The actress and her husband Keith Urban had daughter Faith via a surrogate earlier this year, but Nicole gave birth to her older daughter Sunday Rose in 2008 and said that it was a life-changing experience.
She told The Metro: 'Something happens to you as a woman once you've given birth. You change on a cellular level. You change and are altered.'
And the 43-year-old, who also has adopted children Connor and Isabella Jane from her previous marriage to Tom Cruise, said that she loves motherhood so much that she definitely wants more kids.
'I want more children. I love being around that life force,” she said.
She added that she would also like to experience winning an Oscar again now that she has the support of her husband: 'When I won the Oscar for The Hours in 2003, it just went past,” she explained. “I would so love that moment with Keith because these sort of things are very much about your marriage.”