The couple welcomed their second child, a baby boy, on Wednesday, 30 November. They have not released any details yet, including his name.
Mila has been vocal about expanding her family and gushed about it to Ryan Seacrest on his show, On Air with Ryan Seacrest, back in July.
"I think you know when your family is complete, after we had Wyatt, the second that I gave birth, I was like, 'I know that we need to have another baby.'
We both knew it, we just felt it. And so I always say after the second one, we'll know if we need to have another one. I really do believe you know when your family is complete."
It seems she already has baby number three on her mind.