Mila Kunis is getting more candid than ever in the July 2014 issue of Marie Claire, talking her relationship with fiancé Ashton Kutcher and getting ready to give birth to their first child.

The Jupiter Ascending star, 30, said the “best day” of her life was when her former That 70’s Show co-star, 36, popped the question.

"One day, it just changed. All of a sudden, it wasn't the same. And I was really proud of myself for acknowledging that,” she said of their relationship, which turned romantic after years of friendship. "The best day of my life so far was the proposal. I cried. I was a mess. Not to discredit any relationships in my past, but this relationship is different."

She even beamed with pride over her growing breasts, saying "They've tripled in size. I was a 34A; now I'm a 36C. I'm so excited! I'm telling everyone I know, 'Go ahead, touch them!'"

Kunis, who won’t reveal her due date, said she will allow Kutcher in the delivery room with her but he has to stay “above the action.”

“He'll be head to head. Not head to vag. Unless he wants to risk his life and see,” she said. “But I wouldn't if I were him. I highly doubt he wants to see that being ripped apart and shredded. Because it will be shredded. It's just a matter of how badly."

Kunis confirmed she was both pregnant and engaged last month on The Ellen DeGeneres Show.

image via Peter West/ACE/INFphoto.com