When a young 16-year-old Rihanna debuted her song, "Pon De Replay," no one could have expected how big the native-born Barbadian would become. Now, the singer has sold more than 25 million records, making her one of the most popular singers of her generation. The 24-year-old continues to sing, act, and dance her way all the way to the top.

Rihanna's style can be described as unique and unapologetic. We've seen her in cropped belly shirts, oversized jean jackets and boyfriend t-shirts, but we've also seen her in sophisticated Calvin Klein dresses and custom Alaia. She's fresh off a set of mixed reviews for her newest venture: her Rihanna for River Island collection, but it is clear to all who see it that the designs have Rihanna's name written all over them.

Throughout the years, Rihanna's hair has changed just as much as her style. From long to short, dark to light, natural to braided, the singer isn't afraid to experiment with her hair. Some of Rihanna's hairstyles have been perfect, while others have missed the mark.

Click through the gallery above to see some of our best and worst Rihanna hair moments!

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