The Young & the Rich By Aaron Parsley Jan 13, 2006 05:45PM EST It's a given that young stars like Mary-Kate and Ashley Olsen have more money than most Americans will ever see in their lifetime, but just how rich are they? And how do they compare to other celebrities? Forbes, the money magazine that keeps track of the country's biggest earners, has compiled their annual list of the world's 100 most powerful celebrities and 11 of them are under the age of 25. Even though they haven't made a movie since 2004, the Olsen twins earned $21 million with their production company and retail ventures, but that wasn't enough to put them at the top of the this list. The 21-year-old NBA phenomenon LeBron James, who plays for the Cleveland Cavaliers and is one of the NBA's top players, beat them in 2005. Thanks to his endorsement deals from companies like Nike, Upper Deck and Coca Cola, the 6-foot-8 forward earned $23 million last year. Other celebrities were also busy making money while the paparazzi followed them around. Paris Hilton, 24, pulled in $6.5 million with her reality television series, The Simple Life, her best-selling book and her perfume. Meanwhile, Mean Girls star, Lindsay Lohan, brought in $11 million and her popster rival Hilary Duff made $15 million with her singing, acting, and her clothing and cosmetic lines. Other young rich celebrities include 18-year-old tennis star Maria Sharapova who earned $18.2 million, which is more than her on-court competition, Serena Williams, 24, who picked up $12.7 million. Then there's Malcom in the Middle actor, Frankie Muniz who made $8 million, 21-year-old singer, Ashlee Simpson who made $5.3 million, Brazilian supermodel Adriana Lima, 23, who made $4.5 million and 19-year-old actress Amanda Bynes who made $1.5 million.