The star will spill the beans on "the four loves of his life so far" when he releases Confessions of a Chelsea Boy later this month.
We're not sure who will get a mention, but perhaps former flames Caggie Dunlop, Funda Onal, Louise Thompson and Lucy Watson?!
Spencer's debut book, which aims to be a honest and revealing account of his life, describes him as "charming, funny, a good friend, a less than perfect boyfriend."
While it will mainly focus on life before starring in the Bafta Award-winning show, Spencer will talk about his relationships with best friends Hugo Taylor, Jamie Laing, Oliver Proudlock and Caggie.
Spencer, who is currently dating The Hills star Stephanie Pratt, revealed the news to his fans over Twitter on Wednesday (4 September). He said: "So I've written a book... 'Confessions of a Chelsea Boy' has gone to print and will be out soon..."
The synopsis reads: "Spencer opens up about life before the cameras, including growing up on the beautiful island of St Barths where his parents own the exclusive Eden Rock hotel. He also writes movingly about the devastating loss of his brother on Everest, and the close family ties that ground him.
"Spencer describes his antics at Eton, where the masters declared they'd never met a boy like him before (this was not entirely a compliment), and introduces us to his friends Proudlock, Jamie, Hugo and Caggie.
"He takes us from his first kiss to his many romantic adventures (and misadventures) and describes the four loves of his life so far and why things didn't work out.
"From St Barths to St Tropez, from London to New York, Spencer also gives us glimpses into his world as he gambles with Hollywood stars, runs away from an enraged Middle-Eastern despot, and narrowly avoids death in a powerboat crash. Sensational, entertaining, full of laughter, this is the real Spenny as you've never seen him before."
Confessions of a Chelsea Boy, published by Sidgwick & Jackson - an imprint of Pan Macmillan - will be released on 26 September.
Would you read Confessions of a Chelsea Boy? Tell us below, as the best comment from across the website each week wins £50!