 Horneff was born in Englewood, New Jersey, the eldest of four children of Robin, a choreographer, dancer, and teacher, and Van Horneff, a pistachio farmer, talent manager, race car driver, and real estate developer.His parents own the Robin Horneff Performing Arts Center in Waldwick, New Jersey, and his father also owns a gymnastics mat business.He grew up in Saddle River, New Jersey and attended Bergen Catholic High School in Oradell, New Jersey.