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Lopez is a middle child; she has an older sister, Leslie, and a younger sister, Lynda. The three sisters shared a bedroom. Lopez has described her upbringing as "strict". She was raised in a Catholic family; she attended Mass every Sunday and received a Catholic education, attending Holy Family School and the all-girls Preston High School. In school, Lopez ran track on a national level, participated in gymnastics, and was a member of the softball team. She danced in school musicals and played a leading role in a production of Godspell.