X Factor host Caroline briefly dated Harry in 2011 when she was 32 and he was 17.
Now, in a self-penned memoir, Caroline will open up about her personal life and relationships, including her rumoured past romance with Prince Harry.
Caroline, who presents the revamped ITV2 show Love Island, will also talk about her Xtra Factor sacking and triumphant win on Strictly Come Dancing.
According to The Bookseller, Simon & Schuster UK have bought world rights in a pre-emptive six-figure deal for two books.
S&S commissioning editor, Abigail Bergstrom, said: "She has achieved a hugely successful career on her own terms and I'm thrilled that she has the opportunity to reveal the truth behind the headlines and tell her side of the story.
"She's a vivacious, modern-day woman and not only does she have lots of great stories up her sleeve but she tells them with bags of charm, wit and style."
Head Over Heels will be published in October.
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