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How much do you know about American Idol? Take our quiz.

Steven Tyler, left, Jennifer Lopez, center, and Randy Jackson, the judges on the FOX TV series American Idol, Season 10.
Chris Pizzello/AP
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Question 2 of 32

2. Who is the US best-selling Idol winner of all time?

Kelly Clarkson

Kris Allen

Carrie Underwood

Fantasia Barrino