Mary Nell Steenburgen (born February 8, 1953) is an American actress who won the Academy Award and Golden Globe Award for Best Supporting Actress for playing the role of Lynda Dummar in Melvin and Howard. Steenburgen's other film appearances include Back to the Future Part III (1990), Elf (2003), and Step Brothers (2008). He provides a recurring role in the Fox animated series Bless the Harts (2019).

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