AGE: 16
OCCUPATION: Actress, singer
PREVIOUS APPEARANCES ON THE TIME 100: 1
PRO: She took her Hannah Montana persona on the road for last year's Best of Both Worlds tour, which was either a high-tech examination of adolescent duality or an excuse for some really awesome costume changes. Either way, its $45 million gross topped Journey, Toby Keith and the Jonas Brothers in ticket sales.
CON: Her recent Grammys performance made a good case for Cyrus to stick to acting.