US media reported that Spears had reached a $15m (£11.4m) deal with publisher Simon & Schuster for the book.
"I'm writing a book at the moment and as it's actually healing and therapeutic," Spears wrote on Instagram.AdvertisementBritney Spears' legal battle explained
"I can only imagine that I do sound childish but I was extremely young when those events took place ... and addressing it now, I'm sure it seems irrelevant to most.More on Britney Spears
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