Justin Bieber Seventeen magazine

Justin Bieber reveals his personal secret to his successful relationship with girlfriend Selena Gomez, and it's something anyone can do. "I'm just trying to make [Selena] happy," he says in a new interview. Justin and Selena have been an item for just over a year, and they seem really devoted to each other in public. "I think it's important to make all women feel like they're princesses, because every girl is a princess. I'm serious," he tells Seventeen magazine....