Who do you think is the best female singer out there in the year 2007?

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I would like to find out what people think is the best female singer artist out there in the year 2007? In my opinion, I think Rhianna has the hottest singles out in the year 2007. Last year, she came out with one of my favorite songs "Unfaithful". I also like her song "Umbrella" and the new remix with Chris Brown "Cinderella". What is your opinion?