The former 'That 70s Show' co-stars are also preparing for a wedding as well as parenthood.
Last month it was reported that Mila Kunis and Ashton Kutcher are set to tie the knot.
But the acting pair may also be starting family life earlier than expected as the 30 year-old actress is pregnant, E!News reports.
Towards the end of last month Kunis and Kutcher's engagement became public knowledge after the 'Ted' star was spotted wearing a huge diamond ring.
The siting occurred when Kunis was out shopping with her mother in Los Angeles' Grove shopping center, and several sources confirmed Kutcher did pop the question.
But now as well as planning bridal gowns, venues and everything else that goes with a wedding, the pair will have to prepare for a new addition to their family.
The gossip site also reports that Kunis was spotted attending a parental yoga class in Hollywood recently.
The former 'That 70s Show' co-stars have been dating for two years and have reportedly been thinking about taking their relationship to the next level for some time now.
But Kutcher's prolonged and messy divorce to actress Demi Moore stopped them from progressing with their relationship.
However, since his and the 51 year-old actress' divorce was eventually finalized this past November (2013), Ashton and Mila didn't want to wait too long until they began making wedding plans.
The couple are also notorious for being very private with their relationship, but recently Kunis opened up to Cosmopolitan about their date nights.
"We have a thing called white T-shirt night and it's when you wear jeans and a white T-shirt and you go on a date," Kunis said. "Nothing fancy, it's just something that you love to do. And whether that's bowling or dinner or going to a cheese shop and have some wine or walking around. I think that's just the best thing to do and sometimes it's just nice to stay home."
Despite numerous earlier reports that Kunis is expecting twins, E!News confirms that she is just pregnant with one child.
Kutcher and Kunis are also engaged
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