Levi Johnston 'to pen tell-all memoir'

Levi Johnston has reportedly begun work on a new tell-all memoir.

The book - titled Deer in the Headlights: My Life in Sarah Palin's Crosshairs - will be released by Touchstone Publishing this fall and detail his relationship with Bristol Palin, the daughter of former Alaskan governor Sarah, reports US Weekly.

"He's ready to give an inside glimpse to his relationship with the Palins, share his trials and tribulations of being thrust into the spotlight and becoming a father at such a young age," a source told the publication.

Johnston and ex-girlfriend Bristol - parents to 2-year-old son Tripp - were engaged twice and ended their tumultuous relationship for the final time in August 2010.

He later filed a mayoral bid in his hometown of Wasilla, Alaska and insisted that he was serious about the political role.

Palin inked a deal to write her own autobiography Not Afraid Of Life last month.