Hilary Duff and her husband Mike Comrie wore matching cat burglar costumes last night as they headed to a Halloween party in LA. The parents-to-be brought along bags of fake money and Hilary even brandished a toy gun during their evening out. Hilary, who recently announced that their baby will be a boy, wasn't the only pregnant celeb to dress her bump in costume last night. Beyonce donned a "bumble B" suit for Kanye West's spooky NYC soiree, as well! Hilary's All Hallows' Eve celebration came after a busy first part of the month, most of which she spent promoting her new book, Devoted. Hilary headed to NYC and Minneapolis for signings before flying back home to the West Coast to pay a visit to The Ellen DeGeneres Show.