The 'No Doubt' hitmaker, who has two sons Kingston, six and Zuma, four, together, said it has not always been easy, reported Femalefirst.
"You feel proud. There are just so many rewards that come with it. You have to work at it. But, actually, it's fun to get to this point. Because you learn so much about somebody. It's like these wars that go on and then you kind of get through it to the other side, and it's like, Wow. And obviously, you get stronger," she said.
"And then having kids takes the whole relationship to another place. It is the ultimate collaboration. Both of us have such strong opinions about how it should be, and it's really fun to do it together," she added.
Stefani, 43, also said that Rossdale's decision to spend the past year touring with his band made life difficult for her.
"I mean, he was there for me mentally, but physically? These boys are physical. They wake up and they start punching each other!
"One thing we've had in our relationship the whole time is that we can have it both ways: together, not together, and it's fine. But when you have kids? It's not so great. They need him. Once you have a family, it's just so obvious how everyone needs each other. So it's really nice to have him back."
