London, April 24 - Singer Cheryl Cole is reportedly planning to release her autobiography, in which she will discuss her broken marriage to soccer star Ashley Cole.

The 28-year-old has reportedly signed a deal with publishers Harper Collins for the tome which will hit stores in the autumn. And she vowed to tell all about her marriage to Ashley Cole, who she split from in 2010 amid revelations of his infidelity.

''She signed the deal for big money so she won't be able to hold back on details. Ashley should be worried," the sun.co.uk quoted a source as saying.

''Cheryl's been thinking about doing this for a long time and has spent months preparing, going through old diaries. She wants no stone left unturned. After remaining silent for so long it feels like the right time to speak out," the source added.