Jennifer Lopez is on top of the world. At 50, the multifaceted star is a top-selling vocalist, an applauded actress and a powerhouse producer. But Lopez's life wasn't always this charmed, as she recalls in her cover story for Variety, released Monday. In fact, as Lopez shares in the article, she was turned down for roles in the past because of her ethnicity. "Maybe 30 years ago, it was very 'Oh, you're the Latin girl. You'll do Spanish roles; you'll play maids; you'll only be limited to this little box.' It's about getting people in the business — the agents, the managers, the Tommy Mottolas of the world — to believe this girl can do...