Britney Spears' mother LYNNE has signed a deal to write a tell-all book about life as a celebrity mother. The 52-year-old was previously rumoured to be spilling the beans on her troubled daughter's rise and fall from the limelight in an autobiography - but a statement from Christian publisher Thomas Nelson insists it will focus purely on her skills as a mum. A spokesman for Thomas Nelson confirms, "We've signed her to a deal. "It's a parenting book that's going to have faith elements to it. I don't think it's totally been written yet." The tome is titled Pop Culture Mom: A Real Story of Fame and Family in a Tabloid World, and has been touted as "Lynne Spears' personal story of raising high-profile children while coming from a low-profile Louisiana community". Ironically, Lynne's parenting of the 25-year-old star has been heavily criticised in recent months, most recently by U.S. comedienne Roseanne Barr, who blasted her for failing to stop Britney's party lifestyle. The Toxic star and her mum's relationship has been strained since the singer entered rehab earlier this year (07), but the pair is said to have reconciled following developments in her bitter custody battle with ex-husband Kevin Federline. The book is due to be released in May 2008.