Catherine Anne Bosworth was born on January 2, 1983, in Los Angeles and lived in San Francisco as a child. She is the only child of Patricia (née Potter), a homemaker, and Harold Bosworth, a former executive for Talbots. Bosworth was born with heterochromia iridum, and has a hazel right iris and a blue left iris. When she was six years old, her family moved from San Francisco to various parts of the country due to her father's job. Bosworth was raised mainly on the U.S. East Coast, in Massachusetts and Connecticut.
Bosworth developed an interest in equestrian sports, specifically stadium jumping, and by age 14, she was a champion equestrian. Bosworthaduated from Cohasset High School in Cohasset, Massachusetts in 2001.
