In a post on Instagram, the star said the book is "MY story about MY life" and will include details of her time as a child actress and how she coped with being a teenage mother, as well as "breaking generational curses" and her efforts to "give my children the childhood and family I always wanted".

Set for release on 18 January, it comes two months after elder sister Britney Spears' monumental overturning of her almost 14-year conservatorship in November.

After Britney's first speech in open court earlier in the year - in which the star condemned the legal arrangement and those in charge of it, including father Jamie Spears - Jamie Lynn, 30, publicly come out in support of her sister, sharing a video in which she said she was "so proud" of her for "using her voice".

The following month, Britney, 40, issued a lengthy statement on Instagram, saying: "Never forget who ignored you when you needed them and who helped you before you even had to ask."

Known for starring in shows including Zoey 101 and Sweet Magnolias, Jamie Lynn's memoir was originally to be titled I Must Confess: Family, Fame, and Figuring It Out - referencing lyrics from Britney's debut hit ...Baby One More Time - but has since been changed, according to US media reports.

Sharing details of the book on Thursday, Jamie Lynn, a mother of two, said: "MY story about MY life. From being a child actress, a teen mom, a young woman, battling my mental health, falling in love, finding peace, experiencing a true MIRACLE, getting back to my faith, breaking generational curses, creating my own family, and trying my best to give my children the childhood and family I always wanted."

Britney Spears has been reconnecting with fans more and more after speaking out in open court in June and the court's decision to end her conservatorship in November.

Until then, the star's personal and financial affairs had largely been controlled by her father and others as part of the complex arrangement that began in 2008.

In December, Britney said her years spent under the controlling conservatorship have made her "scared" of people and the entertainment business.

The star said "awful things" had been done to her.

It came as lawyers acting for her father called on the singer to continue paying his legal fees, claiming that he had "stepped up" to protect her from "opportunistic and wholly self-interested parties".