Celeb Hair Makeovers: Better Before or After?

These stars are crossing into new hair-itory (we couldn't resist). Check out Julianne Hough's fresh blonde tresses, Hilary Duff's new gray hue, Christina Aguilera's shoulder-grazing lob and these other major mane changes

KATY PERRY

“SLIME GREEN FOR SPRING,” the singer captioned the photo of her new mane change. While we certainly would not have predicted this as one of the hot colors for the season, the hair chameleon dip-dyed her dark do with help from friends at the Chris McMillan Salon.