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

Simon Cowell, the British judge in a T-shirt, is almost forgotten. Keith Urban, Harry Connick Jr., and Jennifer Lopez have taken over as judges. But even with the changes and competing singing shows, American Idol still reigns as one of the most successful shows in television history. How well do you know this pop-star machine? Take our quiz.

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

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

Kelly Clarkson

Kris Allen

Carrie Underwood

Fantasia Barrino

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