By Caitlin Petreycik
Nov 01, 2011 @ 11:10 am
Courtesy of Jessica Simpson

Jessica Simpson got into the Halloween spirit to announce her pregnancy yesterday! "It's true! I am going to be a mummy!" she wrote on her website, along with a photo of her costume—a sequined mummy outfit! This is the first child for Simpson and her fiancé, former pro football player Eric Johnson. Congratulations to the mummy-to-be!

Plus, see sister Ashlee with son Bronx, and more celebrity mom style in the gallery!

MORE:Hollywood’s Newest MomsBest Dressed Pregnant CelebritiesThe Latest Baby NewsJessica's BeautyMint Site