ET special correspondent Diane Dimond sits down with Levi Johnston, the father of Sarah Palin's grandson -- and the 19-year-old reveals plans to write about Palin in an upcoming book!

When asked if he minds being in Palin's book Going Rogue: An American Life, due out next Tuesday, Levi tells Diane: "I don't care. I mean, she doesn't have anything on me that I wouldn't want the world to know."

"[I've] got my book coming out, and you better believe [she's] gonna be in it," Levi tells ET.

Levi reveals that he hasn't seen his son Tripp in a few weeks, but says that wasn't always the case. When asked what changed his relationship with the Palins, Levi replies, "It just fell apart."

Watch the video for more!