The "St. Elmo's Fire" star has three children with her ex-husband, actor Bruce Willis.
Moore and Kutcher, 32, married in 2005.
"We talk about it and it's something that we would like," Access Hollywood quoted Moore as telling ELLE UK about the possibility of having a baby with Kutcher.
"He's an amazing father to my daughters already, so I have no doubt that if it's in our future it would be another incredible part of our journey together."
Kutcher is best-known for starring in the sitcom "That '70s Show" and for creating the practical-joke series "Punk'd."