The Canadian superstar from Stratford, Ont., earned $55 million in the past year from concerts, music sales and endorsements for products like Proactiv. Bieber -- who was the second highest paid celebrity under 30 on the Forbes list -- has also invested in start-ups including Stamped and Viddy. The pop star, now 18, was barely into his teens when he became a worldwide sensation with hits like Baby and Never Say Never. He's also known for dating singer Selena Gomez, though it's been widely reported that they recently broke up or are having "relationship trouble." But a "friend" reportedly said "they are still very much together."