Our Best of Celebrity Fitness Bracket is underway and some of Hollywood's fittest stars are off to a strong start. If newlywed Jessica Biel wants to remain the fittest of them all, then she's up against some tough competition — a princess and rock star included. With arms like Cameron Diaz and legs like Jessica Alba, the race will be close and every vote counts. Be sure to fill out your entire celebrity fitness bracket today to vote for your favorite toned star of the year! Click here to play now!