Christina Aguilera has had so many different looks and colors, it's hard to believe she still has hair (I've heard rumors that she struggles with traction alopecia , and that her whole Old Hollywood look came about when she realized the big curls were one of the only styles that would cover up the bald spots.

And she started out so fresh and so clean.

Celebrity Hair Gallery Chameleons: Christina Aguilera

Christina hated it. On some MTV show she talked about the struggle she had with record executives over the extensions she wore in her "Come on Over" video. Her hair was a figurative battleground (not quite literally...yet!)

Celebrity Hair Gallery Chameleons: Christina Aguilera

Celebrity Hair Gallery Chameleons: Christina Aguilera

She wanted to look Dirrrty, ok? And then Puta Paint professionals MAC caught a glimpse of Christina's Oompa-Loompa skin and asked her to be a spokesperson.

Celebrity Hair Gallery Chameleons: Christina Aguilera

Charlize theron often wears her medium length hair in classic movie star waves, which can be achieved with smaller rollers and a frizz-fighting gel.

For Charlize's casual look, blow dry hair straight, sweep bangs to the side and pull the rest into a perky ponytail.

Celebrities Hairstyle - Charlize Theron

Celebrities Hairstyle - Charlize Theron