According to Star Magazine, the successful actress, 42, is awaiting her fourth child, her first with Kutcher, 27.
It was the actor who made the announcement to his friends.
Star Magazine revealed that the actress is 8 weeks along, and is due to give birth in October. The pregnancy was confirmed on March 4, when Moore saw her doctor in Beverly Hills.
According to the magazine’s source, the star did not want to announce the pregnancy until she was past the three month mark, to ensure that she didn’t miscarry.
Demi Moore and Ashton Kutcher have been a couple for over two years. Moore was previously married to actor Bruce Willis, and has three daughters from that union.