You may not listen to her music, but someone sure does
Originally via Billboard.com;
Billboard magazine has judged Kelly Clarkson to be the most successful of all the American Idol contestants, with sales even eclipsing those of country superstar Carrie Underwood. Chris Daughtry, not surprisingly, finishes in third.
Tags: American Idol, Billboard, Carrie Underwood, Daughtry, Kelly Clarkson, Simon Cowell