of November, 1950 in Madison, South Dakota, United States of America.As a child and teenager, she lived in Sioux Falls, South Dakota, as well as in Denmark.When that show was canceled four months later, Entertainment Tonight interviewed her about what it felt like to be canceled.The day after the interview, she was hired as an ET correspondent.Hart is known for her shapely legs, leading to an endorsement contract with Hanes for that company's line of pantyhose in 1987.
On August 5, 2010, Hart announced that she was leaving the show at the end of the upcoming 30th season, citing that she was ready for a change.
Mary was named the show’s co-host thirteen weeks later.
After being hired by ET, Mary Hart chose Jay Bernstein as her manager.
Executive Producer Linda Bell Blue described Hart as "the face of ET".
On March 29, 1987 she participated in the World Wrestling Federation's Wrestle Mania III, serving as the guest timekeeper in the main event between Hulk Hogan and André the Giant.