Mila Kunis is married to her "best friend".

And despite their closeness now, Mila - who is pregnant with their second child - admits she went through a period where she no longer "liked" Ashton as she thought he was "crazy".

She said: "There's nothing we don't know about each other because we've known each other for so long: the ugly, the bad, the good."

"We went through a period where I thought he was crazy. At the height of his career, I was like, 'Ugh, I don't like you. I don't even know you anymore,'... then we'd get back together and be like, 'Oh, sorry. I didn't mean to overreact.'

"It truly is being married to your best friend. That's a cliché; it's cheesy. But it's true."

The 'Bad Moms' star knows she can never lie to her 38-year-old spouse because they know one another so well.

She told the new issue of America's Glamour magazine: "We can't bulls**t each other. I literally can't lie to him. He can call me out on everything, and I can do the same, because there's nothing about the other person's face that we don't know. We know when they're acting, thus we know when they're lying."

Mila and Ashton are already parents to 21-month-old daughter Wyatt, and the 'Black Swan' actress is constantly stunned by how "crazy" the little girl is.

She said: "Children are f**king crazy.

"They're also suicidal. Like, at the park, certain jungle gyms have an opening for older kids to jump out of. [Wyatt is] 19 months; she can't jump. She just walks off it as if she's on a pirate ship."

While she describes Wyatt as a "sweet" toddler, the brunette beauty doesn't think she can take any credit for her good nature.

She added: "Another important thing to learn is that kids have a personality that has nothing to do with you. I have a really sweet daughter. She wants to hug all the other kids. I didn't teach her to be sweet. It has nothing to do with me. I've realised you can control only so much."