Described as “The Mogul,” Selena Gomez was ranked No. 1 on Seventeen magazine’s list of the 17 Most Powerful Girls Under 21. Gomez garnered the top spot for her singing, acting, clothing line, investment savvy, social media presence, and role as UNICEF goodwill ambassador. Demi Lovato came in at No. 2, Miley Cyrus No. 3, Lorde No. 9 and Ariana Grande No. 11.