Sellecca was born Concetta Sellecchia in The Bronx, New York to Italian parents, Primo Sellecchia (1924-1987) and Marianna (Acampora) Sellecchia (1929-2020), who were married from 1952 until Primo's death in 1987. At age 12, she moved to Pomona, Rockland County, New York, and attended Pomona Junior High School. While attending Ramapo High School in Spring Valley, she first became interested in the performing arts