Katy Perry has revealed why she hasn't been able to perform at her best after kicking off her "Lifetimes" tour on Wednesday ...

She's got the eye of the tiger, and that's why Katy Perry‘s "Roar" music video has skyrocketed to 4 billion YouTube views, ...

Katy Perry started her 'Lifetimes' tour in Mexico City by singing, 'Not Like the Movies', a song she hasn't performed live in ...

Katy Perry Reveals the Theme for The Lifetimes Tour #katyperry #shorts More from Entertainment Tonight: Exclusives from ...