Katy Perry's hair has been many colors over the years, but this sapphire look is a fan favorite.
The Florence and the Machines frontwoman rocks ruby locks.
Juliette Lewis does pretty much whatever Juliette Lewis wants. This includes wearing Smurf-colored hair.
Platinum hair: Gwen Stefani's trademark.
Katy Perry's hair has been many colors over the years, but this sapphire look is a fan favorite.
It's fire engine red for singer Hayley Williams.
Lady Gaga is known for many things, among them lack of pants, meat dresses, eggs, and remarkably white hair.
Mary Elizabeth Winstead sported boldly colored hair as Ramona Flowers in Scott Pilgrim Versus the World
Michelle Williams manages to make platinum hair look totally natural: A difficult feat to accomplish.
Rihanna first dyed her hair bright red in 2010, and she hasn't looked back since.
Who could forget Kate Winslet's turn as the blue (and orange, and green)-haired Clementine in Eternal Sunshine of the Spotless Mind?
Anne Hathaway sported long white-blonde curls as the White Queen in Time Burton's Alice in Wonderland.
Tilda Swinton's hair can do whatever it wants. Because she's Tilda Swinton.
