More than 15 years after meeting on the set of That '70s Show, life is groovier than ever for Kunis and fiancé Ashton Kutcher: The couple, who have been dating since 2012, are due to welcome their first child later this year, a source confirmed to PEOPLE on March 23. Their baby bliss comes less than a month after their engagement news broke in February. "They are both very, very happy," said a friend.