Mary Steenburgen

American actress Mary Nell Steenburgen born February 8, 1953in Newport Arkansas, she was spotted by Jack Nicholson, who cast her as his feisty "in name only" frontier wife in 1978's Goin' South. Two years later, she won a Best Supporting Actress Oscar® for her performance as Melvin Dummar's inamorata in Melvin and Howard (1980).
Steenburgen was effectively cast as a free-spirited Frisco girl in Time After Time (1979), the corseted matriarch of a turn-of-the-century household in Ragtime (1981), prim authoress Marjorie Rawlins in Cross Creek (1983), a long-suffering suburban housewife in Parenthood (1989), and a Marcia Clark-like attorney in Philadelphia (1993). She also portrayed the Jules Verne-loving Western schoolmarm Clara in Back to the Future 3 (1990)
See her in 2008's Step Brothers with Will Farrell and John C. Reilly.