Levi Johnston

Bristol Palin's babydaddy, Levi Johnston, plans to write a book about his time amongst the Palin family.

The book's title: Deer in the Headlights: My Life in Sarah Palin's Crosshairs.

"I want to tell the truth about my close relationship with the Palins, my sense of Sarah and my perplexing fall from grace -- how I feel and what I've learned," Johnston said in a statement released by Touchstone Publishing, which is an imprint of Simon & Schuster.

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The book is scheduled for publication in the fall.

In the meantime, Us Magazine reports Johnston — a high school dropout who's posed for Playgirl and plans to run for mayor of Wasilla, Alaska — is planning to celebrate his 21st birthday in Las Vegas on May 6.

As to why he's ultimately doing the book, Johnston said in his statement: "I'm doing this for me, for my boy Tripp and for the country."