Former X Factor winner Alexandra Burke has threatened to sue her mum, if she presses ahead with plans to publish a tell all book.

Promising to reveal many details of Alex’s troubled upbringing, Melissa Hill has already put the book together and chosen a picture of Alexandra for the cover.

An insider close to the family told The News Of The World: “It’s all kicked off. Alex couldn’t understand why Melissa would want to write a book against her wishes.

“She has a very dramatic past and doesn’t want it all being dragged up again. So she begged her mum not to go ahead but Melissa needs the money.

“Everybody thinks she’s rich because she has this popstar daughter but the truth is she’s an ill woman struggling to get by.

“Alex does her best to support her mum and would have kept doing that, but she said she’d have to get lawyers involved and sue if Melissa went ahead with her publishing deal.”

The book is titled Heart And Sou and is due to be published in April.

A source close to the star said: “Alex wants to write her own book in the future, telling her story in her own words. This could destroy that.

“She has a very volatile relationship with her mum. All she wants is Melissa to support her, not always try and be in the spotlight.”