Despite weakening television ratings and magazine circulation, Oprah Winfrey remains at the top of the list, a power ranking based on both earnings and fame, according to Forbes.com. The biggest earner is J.K. Rowling, whose final installment of the Harry Potter movie series helped add $300 million to her coffers, solidifying her status as the richest author on the planet. Pop star Miley Cyrus (a.k.a. Hannah Montana) leads a slew of young stars onto our annual Celebrity 100 ranking of the world’s ultrafamous. Also building buzz, and drawing dollars, from the under-18 crowd: Daniel Radcliffe, Zac Efron and Ashley Tisdale. Others in the top 10 list of most powerful celebrities in the world are Tiger Woods, Angelina Jolie, Beyonce Knowles, David Beckham, Johnny Depp, JY-Z, The Police, J.K. Rowling and Brad Pitt.