Rihanna's looks (especially the hair) and image have evolved-from sweet to übersexy-since she debuted on the music scene in 2005 with her reggae-inspired hit "Pon de Replay".

On the cover of Cosmopolitan March 2008 she is wearing Versace Spring 2008.

In just three years, the Barbados native (whose full name is Robyn Rihanna Fenty) has become a megastar.

Here is an extract from her interview:

On her confidence: "A year ago, I would have sat here in my shell with my hands ...