Yes, she "kissed a girl" and liked it and is known to wear cleavage-revealing costumes with unabashed confidence that offended Sesame Street, but what drives a mother to turn on her celebrity daughter and write a book about it?

That's just what Katy Perry's evangelical mom, Mary Perry Hudson, is up to with a new tome about her famous offspring. Reports say Mary is shopping a book proposal, and in the leaked paperwork, Mama P. complains about her daughter's racy lyrics, the horror of Katy's outfits, her "foul-mouthed fiancé" and says, "No mother wants to see the top of her daughter's boobs," reports Page Six.

Comparing their mother-daughter relationship to the conflicts between Billy Ray Cyrus and Miley, and Jon Voight and Angelina Jolie, Mary writes that she hopes Katy is destined to be a worship leader -- "a Kathryn Kuhlman type of healer." Okay.

"I recognized the psalmist gift in her performance. Yet she sang out, 'I kissed a girl, and I liked it,' while thousands joined her. One part of my heart soared... the other part broke for the thousands of hungry souls being fed something that didn't nourish their spirit, but fed their flesh."

To read more excerpts, go to NYPost.com.