I don't kno this 4 sure, but I think katy perry mite be bisexual. Becuz I watched an interveiw wit her on tv. They asked her if she had ever really kissed a girl and she said, "of course i have! I mean, you can't write a song without truth in it!" So, it's true, katy has kissed a girl, but she's adting a boy named Travis Mccoy. So yeah, she's either bisexual or a former lesbian.