Britney Spears‘ first husband, Jason Allen Alexander, is writing a tell-all book about their 55 hours of wedded bliss, and growing up with the star in Louisiana. And, in case you were wondering, it will cover their sex life (or, as he likes to call it, practicin’ makin’ critters).

“Britney knows about it,” he tells the British publication The Sun. “There are things in the book that will upset her… It does feature having sex with her and what that was like.”

Jason, 25, and Britney, 24, married in a Bring Your Own Midriff wedding ceremony in Las Vegas in January 2004 — and annulled the marriage less than three days later.

See more of his revelations below. Particularly entertaining is the part where he notes — without irony — that Spears married second husband Kevin Federline because he was simply “in the right place at the right time.”

On his feelings for Brit:
“I have always loved her and I always will. It’s best for everyone that Kevin and her have split. She is much more confident now.”

On her marriage to K-Fed:
“He’s just a lucky guy who was in the right place at the right time. When I married her I knew she was rich but I did love her. I wanted her. If she had stuck with me it would have been so positive.”

On Britney’s kids:
“I am really surprised at the speed at which they had kids — but it has always been a matter of time.”

On Britney’s plastic surgery:
“She had a tummy tuck after the birth of her second child. She’s working on all of that. She’s worth hundreds of millions — of course she looks good.”

A rep for Alexander tells Us,” It is a true interview. His claims are true as he knows them.”

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