The pop star said she took “a lot of therapy” to finish the book and hopes fans will enjoy it.
Spears’ The Woman In Me will be published by Gallery Books in October.
In an Instagram video posted on Tuesday following the announcement, Spears said: “Okay guys, I just finished my book – it’s coming out very, very soon.
“I worked hard on this book, I had a lot of therapy to finish this book, so you guys should enjoy it.
“And if you don’t, that’s also great.”
The singer added, now that her memoir is complete, she will take a trip to the Bahamas.
“It finally came, my story, on my terms,” she said. Are you ready?”