9. Britney Spears
One of the world’s biggest pop stars, Spears got her start before she was 10 on Disney’s Mickey Mouse Clubhouse. The Queen of Pop had a major meltdown in 2007, after shaving her head, performing an uncomfortably dazed MTV Music Video Awards performance, and attacking a photographer, the star sought treatment and her money was placed in a conservatorship controlled by her father. Four years after her psychological break, the star was back in control with new album Femme Fatale.