"Thanks for the congrats on my fetus! No secrets here; just thought it would be fun to see how big I could get before someone noticed."
She and her husband Dan Maurio are expecting their first child together, after they wed last summer.
Diablo's current projects include the fantastic TV series The United States of Tara starring Toni Collette, and she's also adapting the Sweet Valley High series of books into a movie.
Congratulations to Diablo and Dan!