You can tell her hair to hit the floor.
In a sneak peek of the Feb. 26 episode, the "Part of Me" singer loses a part of her look thanks to auditioner Madison and her guitar. As Katy puts it in E! News' exclusive teaser, "I rocked 'n rolled too hard."
Naturally, fellow judge Luke Bryan uses the moment to give himself a mullet, much to Katy and Lionel Richie's amusement.
The country singer then makes the most of the impromptu hairstyle by performing a quick cover of Cyrus' signature song, complete with hairography. The madness continues until the very last second, when Luke accidentally bumps the crew's boom mic with Madison's guitar.
However, Lionel's enjoyment of the wardrobe malfunction doesn't last for long. That's because Katy eventually lays the stray hair on his head, saying, "You have been given the crown."
Episode two of AI season 21 will continue with auditions in New Orleans, Las Vegas and Nashville. During the premiere, Tyson Venegas scored the first of three platinum tickets allowing him to skip a round.
See who else makes it to Hollywood Week every Sunday on American Idol, only on ABC.