Listen to Katy Perry on iHeartRadio

Actress Kate Hudson introduced the singer formerly know as Katy Hudson (now known as Katy Perry) to the 2013 iHeartRadio Music Festival stage. 

PHOTO: Getty

Katy took it from there playing a mash-up of some of her biggest hits including 'California Girls' and 'Teenage Dream.'

PHOTO: Brian Friedman for iHeartRadio

She also debuted her new single 'Dark Horse' featuring Juicy J, which is off her upcoming album 'Prism.'

PHOTOS: Katy Perry performing at the 2013 iHeartRadio Music Festival

PHOTO: Getty

"I missed you," proclaimed Katy as a boxing ring came out on stage for her epic performance of 'Roar.'

PHOTO: Roger Kisby for iHeartRadio

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