Katy Perry, Marge Simpson, Juliette Lewis

Jason Merritt/Getty Images; Jason Merritt/Getty Images; Fox

Hollywood has a serious case of the blues.

In fact, celebs are dying over it...

But no need to offer anyone Prozac for it. We're talking about blue hair.

Stars ranging from Katy Perry to Maddox Jolie-Pitt have sported the edgy look. And just this week, Juliette Lewis showed up to the red carpet premiere of The Switch donning some rocker blue tresses.

Check out some more blue-hued celebs in our Hollywood Blues: Dye Another Day photo gallery.

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