A celebrity's hair is often like a brand. When Katy Perry made her debut in 2008, she was instantly recognizable for her jet black, pinup girl hair. Similarly, when Kim Kardashian first broke onto the scene with her E! reality show, Keeping Up With the Kardashians, her effortlessly tousled long brown locks defined her glamorous Los Angeles image.

Of course, no one likes to stay static, and drastic hair transformations—whether in cut, style or color—are par the course for celebrities who are ready to make a career change or alter their public image.

Below, check out ten drastic celebrity hair transformations.

Surprising Celebrity Hair Transformations