Kelly Clarkson, ‘Stronger’ Is Best-Selling Single By ‘Idol’ Alum
Kelly Clarkson and Carrie Underwood have both had dream-worthy careers since becoming "American Idol" winners in 2002 and 2005, respectively. But while they both have sold out arenas and enjoyed chart-topping hits, there's one area in which it seems Kelly is the 'stronger' champion of the two...