She's got the eye of the tiger, and that's why Katy Perry‘s "Roar" music video ... and you're gonna hear me roar," she belts ...

UNICEF released this video with Katy Perry to highlight the issue. Even though more girls are entering school than ever before, 31 million are still denied this right. The world needs new ...

Katy Perry could really hear her fans 'Roar' last night ... probably screaming out in horrible pain -- 'cause one of them touched a transformer and ended up on fire, and nearly disfigured the pop star ...