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.

Carrie Underwood‘s American Idol journey has come full circle. Fans first met Underwood when she auditioned for season 4 of the singing competition. Following her 2005 victory, Underwood went on to become one of the biggest names in the country music world,