NBC has filled the casting cupboard for its upcoming unscripted series Celebrity Cooking Showdown. Supermodel Naomi Campbell, Days of Our Lives star Alison Sweeney and country music performer Big Kenny are among the celebrities who have been lined up for the cooking competition series. They will be joined by celebrity chefs Wolfgang Puck, Cat Cora (Iron Chef America) and Govind Armstrong, executive chef and owner of Los Angeles restaurant Table 8. The hosts of Showdown will be Alan Thicke (Growing Pains) and Sandra Lee (Semi-Homemade Cooking With Sandra Lee), says The Hollywood Reporter.