Alexandria Karlsen is used to the fast track. She grew up in Mesa, Arizona and started reading before she was four. At the age of 11 Lexie would devour a Stephen King novel in one sitting. At 15 she edited her school’s newspaper and wrote columns for three local papers, and at 18 she earned a license to deal in mutual funds (that’s her on the trading floor). She also found time to show off the other side of her beauty-and-brains equation, by sending her photos to Playboy. Clearly, her stock is on the rise.