Laura Prepon, who starred with the couple on 'That 70s' show for nine years until 2006, can't wait for them to welcome their first child, rumoured to be a baby girl, later this year.
The 'Orange Is the New Black' star told UsMagazine.com: ''It's going to be great.''
The 34-year-old actress previously revealed she is still very close to all of her former co-stars as they ''grew up together'' and would love to be a bridesmaid at Ashton and Mila's upcoming wedding.
She said: ''Of course I will [be there]. Are you kidding? All of us are going to be right up there on the altar.''
The actress also said she ''wasn't surprised'' when the couple, who got engaged a few months ago, started dating in 2012 following his split from ex-wife Demi Moore in 2011 because the 30-year-old actress shared her first ever kiss with the 36-year-old actor when she was a teenager.
Asked about their romance in the past, Laura, who was recently linked to Tom Cruise, said: ''It's incredible. I wasn't surprised either.''
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