Rhea also starred as Hilda Spellman for the situation comedy Sabrina , the Teenage Witch and replaced Rosie O'Donnell as the hostess for her syndicated talk show ( which was renamed the Caroline Rhea Show ) . She is also known for her role as Hilda Spellman on Sabrina , the Teenage Witch , and for replacing Rosie O'Donnell as the hostess of her syndicated talk show , renamed The Caroline Rhea Show .