The original American Idol brings pop down-home in Vegas. Plus: Mary-Kate & Ashley, Lindsay and more


Clarkson snuggles up to Rascal Flatts's Joe Don Rooney as they perform "What Hurts the Most" at the ACMAs on Tuesday. Another Idol winner was there to watch: Carrie Underwood, who picked up two trophies, including top new female artist of the year.