When she popped onto the music scene a few years ago, Keri Hilson proved to be more than just a sweet voice and pretty face — she was already an accomplished songwriter, penning hits for the likes of Usher and Ciara. In a short time, the sweet and sassy crooner has evolved both in her career and in her style, morphing into a trendsetting lady who evokes the glam and polish of old school entertainers. Here’s a look at her transformation from girlfriend to glamour girl.