The 31-year-old singer said that she plans to share her real experiences to be in the group for over 10 years, reported Digital Spy.
"People have been asking me to tell my story for years but it never felt right while the band was still together. Now, as we all turn the next page in our lives, it feels like the perfect time for me to share with my fans what my life is really like," she said.
The band recently announced that they were splitting up following the end of their tenth anniversary tour.
Pop star Cheryl Cole released her own autobiography 'My Story', while Girls Aloud have already released a joint book titled Dreams That Glitter.