Kathryn Bridget Moynahan, although born in Binghamton, New York, on September 21, 1972, was raised primarily in Longmeadow, Massachusetts.

She considered herself as a tomboy during her childhood, having great performance at sports. During high school, she was the captain of the basketball team and she also played soccer.

Bridget Moynahan played mostly sports in her childhood before going on to become a fashion model appearing on magazines such as Glamour and Vogue.