If you're going to be a rock star then you need to act like one, dress like one, and sing like one. Some celebrity hair styles go to the extreme with bright colors and streaks, while others keep a hard edge, but remain subtle. Katy Perry loves to change up her color from blond to pink to...blue! Her quirky fashion choices go perfectly with her rocker hair. Then there's Nicki Minaj who is in a world of her own when it comes to clothes and hair. If she's wearing a leopard dress then her hair will follow suit. She's certainly not afraid to go big and bold. Gwen Stefani and Rihanna love to rock statement hair but keep it sleek and tame. Check out some more of Hollywood's craziest hair moments below.

To see the full list of rock star hairstyles at EOnline.com.
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