Mary Jo Eustace is a Canadian actress and chef who appears as a co-host on the cooking show What's For Dinner? Eustace is also the ex-wife of actor Dean McDermott.
In her second book, Eustace claims McDermott was cheating on her with his current wife, Tori Spelling, prior to their divorce. He also says the producers of McDermott and Spelling's reality show Tori & Dean Home Sweet Hollywood approached her about joining the show to create drama, however she passed on the offer.http://perezhilton.com/2009-09-28-tori-and-dean-and-his-ex-wife