Fox has unveiled its latest reality series, and it sounds just dumb enough to work. In My Big Fat Obnoxious Fiancé (debuting Jan. 19), a beautiful "bride-to-be" named Randi plays a practical joke on her family and friends when she announces her engagement to Steve — an individual so loathsome he makes Bob Guiney look like Prince Charming. Randi must continue the charade all the way through to the wedding ceremony in order to win a million dollars. But the joke is also on Randi, who is under the impression that Steve is just a reality show contestant like herself. In reality, he and his family are professional actors.