Caroline Gilchrist Rhea (born April 13, 1964) is a Canadian stand-up comedian, actress and model who was the original host of the reality television show The Biggest Loser on NBC until she was replaced by Alison Sweeney after the end of Season 3. She is also known for her role as Hilda Spellman from Sabrina, the Teenage Witch, and for replacing Rosie O'Donnell as the hostess of her syndicated talk show, renamed The Caroline Rhea Show.