14. Britney Spears
Oops, she did it again—but this time hopefully it’s for good. Britney went from 90s tween phenomenon, to head-shaving crazy, to young lady hosting The X Factor. Wondering whether Miley Cyrus will follow her steps.

15. Justin Timberlake
He used to be a mouse-ka-teer (sp) and now he shares the world with Jay-Z.