Katy Perry, Nicole Richie

Our favorite celebs are shaking up the hair game with some striking colors this season. It may have started with Kelly Osbourne's lavender locks, but it looks like dramatic color changes are also being made by some stars you wouldn't expect. Eccentric hair hues are becoming rapidly more popular, so we've decided to round up some of the best looks so far. Click through to see some of the daring color changes celebs are making this spring.