we're pretty sure Manic Panic's about to be sold out everywhere. From Cara Delevingne's punk-pink festival hair to Gwen Stefani's '90s bubble-gum pop waves, there's no shortage of celebrity ...

Nico: Today I'm gonna be testing out four temporary hair dyes. I'm somebody ... This is the pinkest pink I think I've ever seen in my life. I've heard of Manic Panic before. Never tried any ...