"And there is only one other person that's going through it. So it brings you very close, and it's deeply romantic. I'm sure Brad and Angelina have that - because there's nobody else that understands it except that person who's sleeping right next to you."
The Oscar winner is now married to Keith Urban and says the Australian country music star is the love of her life.
"With no disrespect to what I had with Tom, I've met my great love now. And I really did not know if that was going to happen. I wanted it, but I didn't want it for a while, because I didn't want to jump from one relationship to another.
"I had a lot of time alone, which was really, really good, because I was a child, really, when I got married (to Cruise). And I needed to grow up."
Kidman and Urban wed in 2006. They now have two daughters together, Sunday Rose and Faith Margaret .
The actress is also mum to her adopted children Isabella and Connor Cruise.
- WENN