Vicki Lawrence is an American comedienne and actress, best known for her work on The Carol Burnett Show where she originated the character of Thelma "Mama" Harper, who was later featured in a spin-off Mama's Family. On Phineas and Ferb, she voices the role of Hildegard Johnson. Image:Vincent Martella.jpgThis article is a . You can help Phineas and Ferb Wiki by expanding it.