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Catherine Tate's Nan is a British sitcom created by and starring Catherine Tate. Tate plays the titular character, Nan, who is the eccentric and outspoken grandmother of the show's main character, Catherine Tate. In the series, Tate also plays the character of Joanie Taylor, Nan's best friend. Joanie is a kind and gentle soul who is often the voice of reason in the midst of Nan's antics.