And for the mum-of-four, it's all about making it work.
Shedding a rare light into their romance, the actress sat down with Glamour magazine, revealing the couple believe in having roles.
Nic says her country crooner beau acts like the "tough" one, which allows her to be more "sensitive" and "raw".
Tom Cruise's former wife was interviewed by filmmaker and writer Rebecca Miller, who asked, "How do you tell yourself, after so many years in Hollywood, 'It’s OK to keep your heart out?'"
The Big Little Lies starlet told her good friend, "Well, Keith always says to me, 'You stay raw and sensitive, and I’ll buffer things for you.'"
She continued, "He is always told, 'You're so tough.' And he says, 'That's not what I want for you, Nicole. You don’t need to get a thick skin.'"
The 50-year-old explained this gives her the chance to "be less guarded and more curious."
A woman of many words, Nic described Keith's actions as a "beautiful offering."
It clearly works for the Aussie power couple.
Nic and Keith tied the knot in a stunning Sydney wedding back in 2006.
Today, they're the very proud parents to nine-year-old Sunday Rose and six-year-old Faith Margaret.
The actress, who has helped champion women's voices especially with her powerful work on the mini-series Big Little Lies, also shared her new work ethos.
Watch her remarkable Emmy's speech that had women across the globe standing up and cheering!
Nicole has vowed to work with a female director every 18 months.
"As an actor you’re only as good as the things you’re offered. And there just weren’t any women offering me things," she told the glossy.
"So when you dissect that, you realise there aren’t women offering you things because they don’t have the opportunities," she mused.
"I work to raise money for women’s cancers; I use my voice for violence against women. And so I was like, 'I need to be part of the movement that will, hopefully, change the statistics in my field.'"
Her remarkable promise is something that will impact her daughter Sunday Rose, who looks to be following in her mummy's footsteps.
"My nine-year-old daughter wants to be a director right now. Her whole attitude is 'The world’s my oyster.' She doesn’t realise that it’s actually not."
She passionately continued, "I also can’t be talking about it and not doing it. Because, to be an advocate, you have to actually put things into action."
"It’s like, 'OK, Rebecca. You’re making a movie? Let’s go.' 'OK, Karyn Kusama'—I’m working with her next—'we may not have an enormous budget, but let’s go do it. I’ll get down in the trenches with you.'"