The former 98 Degrees singer, 47 claimed he's never read the blonde babe's memoir, and never will — as he already knows how the story goes.
Simpson, 41, published her tell-all memoir Open Book in February 2020, in which she detailed her most personal struggles, including her battle with alcoholism and broken relationships.
“You’ll be shocked to hear that I have not,” he responded. “Nor will I ever read that book.”
Cohen followed up by asking the singer if anyone has ever given him the “low down” on the book, even though he's expressed his blatant disinterest in opening it up himself.
“Here’s the thing,” Lachey said, “I obviously knew the book was coming out, but I lived the book.”
He continued: “I know what the truth is so I don’t need to read it, or read someone’s version of it in a story that I know, that I lived it.”
Cohen brought up that Simpson is planning a fictionalized drama based on her life, and asked Lachey who he would like to play his role in the film.
However, the former boy band member seemed to dodge the question, insisting his former marriage is no longer part of his life these days.
“That was 20 years ago. It’s honestly the last thing on my mind these days unless when someone brings it up,” he candidly said. “I understand why people want to ask but it’s just so not a part of my life anymore that it’s not even on my radar.”
“She is doing her thing and I am doing mine and that’s how it should be,” he concluded.
Lachey and Simpson both remarried years after ending their relationship, and happened to have gotten engaged within days of each other.