It's hard to believe that "Stay" singer Rihanna turned 25 yesterday. Born and raised in Barbados, she appeared on our radar just over seven years ago and since then has become renowned for switching up her beauty look on an almost weekly basis. From a sleek '50s-rockabilly style up do, to a choppy pixie cut and beyond, this new MAC collaborator has no qualms about changing her look drastically. Hairstylist Ursula Stephen says that Rihanna's 'do "typically changes depending on what’s on our agenda, what she’s wearing, or how she’s feeling." To celebrate her birthday, we're taking a trip down memory lane to scope her best hairstyles — we've picked 30 — from over the years.