Carrie Underwood is a judge on American Idolnow, and she recently joined a contestant singing Korn and Drowning Pool classics during his audition. The country vocalist became a superstar after winning the fourth season of American Idol back in 2005.

American Idol is back once more to showcase new competition and talent. But this year will feel a little different with Katy Perry stepping down. Perry has served as a judge since the series was rebooted in Season 16.

Carrie Underwood was given an iconic new nickname by fans as she made her judging debut on American Idol. American Idol kicked off its 23rd season Sunday night, bringing a fresh wave of talent and a major shake-up at the judges' table.