Mila Kunis on Ashton Kutcher: "I found the love of my life"

Mila Kunis and Ashton Kutcher played romantically-involved characters on "That '70s Show" long before they became a couple -- which means the two shared some major milestones on-screen.

"My first real kiss ever was with him on the show," Kunis said in a new interview with W magazine. "And when 'That '70s Show' had a prom, my date for the prom turned out to be my fiance. We can honestly say that we went to prom together! Although I do think that in that episode I went home with someone else. We don't talk about that part."

"We all get movie star crushes," she added. "I'm marrying mine."

Now engaged to Kutcher and expecting the couple's first child, Kunis, 30, admitted in the interview she didn't think she would ever get married.

"From the age of 12, I prepared my parents for no marriage. Then things changed -- I found the love of my life," she said. "Now my theory on weddings is: Don't invite anyone. Do it privately and secretly. My parents are okay with that. They're just excited that I said yes."

Kunis, who appears next in the sci-fi film "Jupiter Ascending," is also planning to take time off after the baby arrives later this year.

"I have never wanted to be the person who only has business on her mind. To me, this job has always been a hobby that turned into a great profession, but I don't eat and breathe acting. I'm sure Meryl Streep has a very different point of view. But I'm excited about being a full-time mom," she said. "Although, give me a year of not working and I'll see how I feel."

The August issue of W, with Kunis on the cover, hits newsstands July 9.