Mila wants Ashton at birth

Mila Kunis and Ashton Kutcher. Picture: GC Images

Mila Kunis says she wants her fiance Ashton Kutcher present at the birth of their baby - as long as he stays clear of the action.

"Two people are allowed in my delivery room. My doctor and my significant other," the actress told US Marie Claire.

"And he is staying above the action ... I highly doubt he wants to see (me) being ripped apart and shredded. Because it will be shredded. It's just a matter of how badly."

Kunis made headlines this week with her rant warning men to stop saying "we're pregnant".

Now she says she's happy for her partner to be at her side during the birth as long as he stays at the top end of the delivery bed.

Kunis and Kutcher met in 1998 as co-stars of the popular US sitcom That '70s Show, in which they played an on-screen couple.

Their off-screen romance didn't begin until April, 2012, months after his 2011 separation from ex-wife Demi Moore.

"One day, it just changed," Kunis said of her relationship with Kutcher.

"All of a sudden, it wasn't the same. And I was really proud of myself for acknowledging that.

"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."

Kunis, 30, has never been married but enjoyed a long-term relationship with Home Alone star Macaulay Culkin between 2002 and 2011.

At the time she said they didn't wed because marriage wasn't "important" to her.