Mila Kunis' first kiss was with Ashton Kutcher.

The 30-year-old actress shot to fame starring on 'That 70's Show' with her now-fiance and she is delighted that some of her teenage milestones were marked with the hunky actor, even if they were only on screen.

She told the new issue of W magazine: ''My first real kiss ever was with him on the show...and when 'That 70's Show' had a prom, my date for the prom turned out to be my fiancé. We can honestly say we went to prom together!''

The 'Friends with Benefits' star previously admitted she never wanted to get married until she fell for Ashton.

She said: ''I never wanted to get married. From the age of 12, I prepared my parents for no marriage. Then things changed - I found the love of my life.''

The couple are expecting their first child - a baby girl - together in October and Mila has admitted she will be putting her career on hold to be a full-time mother.

She said: ''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.''

Ashton began dating the brunette beauty in 2012 following his split from his first wife Demi Moore in 2011.

The former couple's divorce was finalised last November and Ashton popped the question to Mila a few months later.