The daughter of filmmaker Ron Howard married actor Seth Gabel in 2006. They have a 4-year-old son named Theo.
Howard is best known for her work in "The Village," "Lady in the Water," "Spider-Man 3" and "The Twilight Saga: Eclipse."
Gabel has appeared in "The United States of Tara" and "Fringe."
Us Weekly did not say when Howard is expected to give birth or what the baby's gender is.