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Anne-Marie Johnson (born July 18, 1960) is an American actress and impressionist. She is perhaps best known for her roles as Nadine Hudson–Thomas in What's Happening Now!! (1985–1988), Althea Tibbs in In the Heat of the Night (1988–1993), or her recurring role as fashion designer Donna Cabonna on That's So Raven (2006) during its final season. Wikipedia