Rihanna. By now, her name is synonymous with a few things: Umbrellas. Rude Boys. Sharp-shouldered silhouettes. And lastly, but perhaps most importantly, hair. The Barbadian beauty famously chopped her long locks into a boyish crop for the release of her 2007 album "Good Girl Gone Bad" and almost overnight, she went from dancehall-ish two hit wonder to international pop phenomenon! We know that hair can't make you a star, but we also know this--every time RiRi rocks her short hair in a new style, whether it's highlights or curls, everyone from A-listers to your BFF tries to copy it. Go head with your fierce hair, RiRi! Here, we take a look back at the Grammy-winning artist's hottest mane moments.