First of all, this list is simply an opinion. Do not take this as law.
Rihanna is number ten because she is just starting to really wear what she wants to wear. She has said that she likes to be risky with her fashion. She looks great in all she does and will eventually be influencing pop culture. You can catch her at Rihanna Style where she gets in depth on her fashion making decisions.
9. BLACK EYED PEAS