Ukrainian-born Mila and her former “That ’70s Show
” co-star have two children — 2-year-old daughter Wyatt
and son Dimitri
, born last November. “Demi has three girls, and she still manages to stay in great shape … Mila fears she won’t compare,” the source said. “Ashton wants a house full of kids, and Mila wants more, too, but worries how her body will handle it. It took a lot of work and dieting to lose her pregnancy weight." “Hollywood is cutthroat as it is — and now she has to age in the shadow of Demi’s perfection!” added the source.