American Idol' judge Katy Perry hoped for sold-out venues with her new world tour. Unfortunately, she's reportedly 'disappointed' with low ticket sales in some cities.

Carrie Underwood has made a name for herself in music since winning American Idol in 2005, but her impressive career and past success on the show don't mean she's making the same money Katy Perry did as a judge on the show.

American Idol's new judge Carrie Underwood admits to the thing that will make her a better judge as the competition moves ahead amid signs of change.