Leona Lewis is sitting pretty at the top of the iTunes music chart with her hit single, "Bleeding Love." She won Britain's "X-Factor" -- and Simon Cowell says he's intimidated by her! But who, exactly, is she?

Our own Terri Seymour sat down with Ms. Lewis and Mr. Cowell after their appearance on "Oprah" -- and got the scoop from Britain's hottest newcomer - and the man who discovered her.

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