Forbes Magazine has released its list of 100 of the World's Most Powerful Celebrities, with Jennifer Lopez taking the coveted top spot. It's her first time on the list and she joins Oprah Winfrey and Justin Beiber in the top three. Also making the list: Lady Gaga, Rihanna and Kim Kardashian. Gillian Pensavalle thinks that as long as you're getting attention, you'll stay on the list.