Hindsight & All the Things I Can't See In Front of Me, is a "collection of anecdotes, reflections, and observations" on his career.
Justin's book, which was written with the help of New York Times best-selling author Sandra Bark, looks set to fly of the shelves as the chart-topping singer was never far from controversy.
The N'Sync star hit headlines for "Nipplegate" – during his half-time show at Superbowl in 2004 when Janet Jackson's boob was exposed.
The Cry Me A River singer, who was dubbed "Trousersnake" after dating a string of stars including Britney Spears and Cameron Diaz, also recently confessed to hooking up with a Spice Girl.
Fans can't wait for the book to come out in October and flocked to his Instagram to let him know, with one saying: "Can't wait you are my favourite!" and another adding: "Awesome, JT! Congratulations."
The book also includes "hundreds of candid images from his personal archives that range from his early years to the present day, in locations around the world, both on and off the stage."
Sandra has previously worked with Cameron Diaz on her bestsellers 'The Body Book' and 'The Longevity Book.'
Meanwhile last May Justin revealed he'd had a sexual encounter with one of the Spice Girls, but did not say which one.
But on Loose Women days after, Scary Spice got VERY awkward when asked to reveal who the Naughty Spice was.
Ruth Langsford asked her the question during a fun game that involved Mel holding up paddles with the Spice Girls faces on it.
She quizzed Mel: "Which Spice Girl snogged Justin Timberlake?"
The singer then sighed, looked shifty, then grabbed paddles for all five members and showed them off in a frenzy – hinting it could've been her.
The whole "whodunit with Justin" saga started when Justin at the N Sync boys were playing Never Have I Ever on the Ellen DeGeneres show.
"Never have I ever hooked up with a Spice Girl," said Ellen before the stunned audience watched Justin, 37, go sheepishly quiet.
Bandmates Lance Bass, JC Chasez, Joey Fatone, and Chris Kirkpatrick lifted up their "I Have Never" paddles.
Justin, who is married to Jessica Biel, eventually turned his paddle round to show the words "I Have” but refused to admit which one he hooked up with.
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