25 Hottest Hollywood Hair Change-Ups of '09

From Nicole Richie's walk on the dark side to Kellie Pickler's red alert, rate the biggest color and cut changes!

ASHLEY TISDALE

"I loved being my natural color," the singer-actress recently Tweeted after bleaching her brown hair blonde, explaining, "It[']s for an upcoming project which I'm really excited to share with you soon. I love you all! Xoxo."