Mila Kunis and Ashton Kutcher wanted children "so bad".
The couple - who married in 2015 after three years together - are incredibly "grateful" to have three-year-old daughter Wyatt and son Dimitri, 11 months, because they really wanted a family of their own.
She said: "I have an 11-month-old and a three-year-old - I have tiny little humans. Ashton and I wanted kids so bad; we were so ready to be parents.
"We were able to have this little family the way we wanted, and I'm so grateful for it and it's the one thing that I can't control.
"That's where my vulnerability is. My job, it comes and goes. You don't get a job, you get a job, you don't get a job. Your kids, you just want one thing."
The 'Bad Moms Christmas' actress loves the fact she can often take her kids to work with her and she and Ashton, 39, constantly remind one another about how fortunate they are.
Speaking to Net-a-Porter's The Edit, the 34-year-old beauty said: "Our kids have a crazy fun life where they visit at work.
"I take it for granted; I take so much of my life or granted.
"Both my husband and I try daily to remind ourselves how truly lucky we are."
Since Mila and Ashton - who had been friends for several years after starring in 'That 70s Show' together - got together romantically, the 'Black Swan' star has got more "involved" in her own career because her spouse encouraged her to learn more about the "business side" of her profession.
She admitted: "Honestly, full disclosure, when I started dating Ashton, I was like, 'I don't want to know [about the] business side, it makes me so uncomfortable.' And he said, 'Right, stop, get on the call.'
"And then I started educating myself, getting the language right. I would ask him questions, Googled lots of things, and now I know what everybody's doing, I know what I can do, I know what I can ask for. I am way more involved than I was five years ago.
"I've been in the industry 25 years and only five years ago I started. Think about that, perspective-wise."