Not only are Mila Kunis and Ashton Kutcher reportedly engaged ... they're also expecting a baby, according to sources who talked to Us, E!, People, and Gossip Cop. They say Kunis is pregnant—with just one child, not twins, as was rumored last week. Need more proof? She was reportedly seen at a Hollywood prenatal yoga class. "They are both very, very happy," says one source. "It’s still early." Another adds, "This is something they both wanted."