If you think you think Jack Osbourne’s life is already an open book, think again. The son of Ozzy and Sharon and star of “The Osbournes� has gotten a deal to write an autobiography.

The tome will be titled 21 years gone, and though Jack is just 20, he will be on the verge of turning 21 when the book is released in October. In the book, Osbourne is expected to cover his OxyContin addiction, the pressures of fame and his recent dramatic weight loss.

Jack’s book will have to be a real page-turner to make waves in his family. His mother’s autobiography, Extreme, which came out in 2005, is the best-selling hardcover autobiography ever in Britian.