Copperfield, 57, has been dating Gosselin, 28, for about six years, UsMagazine.com said Monday. Gosselin is the mother of the magician's 3-year-old daughter, Sky.
"I'm engaged and in a committed relationship with Chloe in my mind and my heart," Copperfield told Hello! magazine recently.
"I'm so lucky to have found David," Gosselin told the magazine. "There are very few people in the world like him. He's spent more than 30 years at the top of his profession. He's achieved some extraordinary things."