Former Blue Peter star Katy Hill scarred for life after headbutting her toilet

American Idol: Katy Perry teases Ryan Seacrest over starting 'mosh pit' with overexcited contestant

'American Idol': Fans Go Wild Over Katy Perry's New Look As the Season's Top 16 Are Revealed

Katy Perry turns back time as she goes back to her signature raven-colored locks in selfies