No, they are not related, Katy Perry's real last name is Hudson. She took her mother's maiden name as her stage name, to avoid confusion with actress Kate Hudson.
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Actually, Katy Perry is not her real name. Her real name is Katheryn Elizabeth Hudson. She thought Katy Hudson and Kate Hudson might get a little confusing, so she took her mothers maiden name, Perry.
No. She is not Her brothers name is David and her dad's name is Keith. And her birth name is Kathryn Elizabeth Hudson. And Russel Brand, her husband As Of October...