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Well there's fanmail, but I haven't heard of anyone getting a reply from that in a long time. Otherwise her twitter is @katyperry. But the chances of her seeing any tweet from you would be miniscule and there isn't really any way to contact her via facebook and those are the two that are updated most often. We don't know her private mail obviously for privacy reasons. Realistically there isn't really any way to contact her. Sorry to disappoint!