Britney Spears' mother Lynne Spears is writing a book on parenting for Christian publisher Thomas Nelson, Usmagazine.com has confirmed.

"We've signed her to a deal," a spokesman for Thomas Nelson tells Us. The book, which will be coming out next Mother's Day is titled "Pop Culture Mom: A Real Story of Fame and Family in a Tabloid World."

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"It's a parenting book that's going to have faith elements to it. I don't think it's totally been written yet," says the publisher's rep, who expects the manuscript by December.

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Lynne, 52, recently reconciled with her daughter after months of estrangement (though Us reports in its new issue that the singer has recently cooled things off again). Britney, 25, cut her mother out of her life and refused to allow her to see her grandchildren after Lynne entered the singer into rehab last February against her will.