The 'Grace of Monaco' star, who has two daughters, Sunday, five, and Faith, three, with the country music star, also consults her husband before taking on any film roles, as their family is the most important thing to her.
Asked if she would have taken on the part in the controversial new movie without the 'American Idol' judge's approval, she said: ''If he said no, I wouldn't have done it. That's how we are.''
She added: ''I know this sounds old-fashioned, but I do put it on the table. Because if it won't work for us, then I'm not doing it.''
The 46-year-old star wouldn't hesitate to give up her career for the sake of her marriage to Keith.
She told the MailOnline: ''Yeah, if he asked me. No question.''
The Oscar-winning beauty, who also has daughter Isabella, 21, and son Connor, 19, with her ex-husband Tom Cruise, added: ''I know now what I probably didn't know in my 20s. I would absolutely know now that I would always choose the sanctity and sacredness of my family, and if that was ever in jeopardy, no question.''
Despite her traditional approach to family, Nicole still considers herself a feminist.
She said: ''I was raised to speak my mind. I was raised by a feminist mother. So my antenna for that is very strong.
''I am a huge believer in the education of women, which is why I sit here and say in terms of the girls in Nigeria that have been kidnapped, we have to fight to bring them back. Being born female your birth-right gives you the right for education.''
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