Last night newly banned Instagrammer Rihanna tweeted a picture of herself with a pink pixie cut, along with the perfect caption: "We raided Nicki's wig closet for the summer! Bad gals just wanna have fun!" Nicki Minaj's wig collection aside, Rihanna's reference to Cyndi Lauper's breakthrough single is fitting since she was the first pop star to champion pink hair back in the '80s. Since then a handful of female singers have followed. In honor of today being (Pink) Friday, here are the ladies who have worn the cotton candy hair color best.