Carrie Underwood, the Grammy-winning country singer and winner of American Idol's fourth season, will replace Katy Perry as a judge on the show's 23rd season. This marks a full-circle moment for Underwood, who has enjoyed a successful career following her 2005 victory. Fellow judges Luke Bryan and Lionel Richie have expressed enthusiasm for her addition, with Bryan humorously advising her to 'up her therapy' to handle the pressure and antics on set. Underwood has committed to being honest and constructive in her new role. Her addition brings high expectations for ratings and a fresh perspective as a former contestant. This announcement comes after Underwood turned down offers from other shows like The Voice, remaining loyal to American Idol.