Holly Madison is finally revealing what caused her years-long feud with her “Girls Next Door” costar Kendra Wilkinson.

“Kendra and I don’t speak,” Madison said on Thursday’s episode of the Hot Goss podcast, “but I’m not opposed to speaking. We had a falling out, but it was after the show.”

Madison, 46, blamed their “falling out” on Wilkinson’s desire to stay relevant.

“At the time, she was really caught up in the tabloid cycle. If her thing to get in the tabloids that week was a rift with someone, then she was going to say it,” Madison explained.

The duo starred in the reality show alongside Bridget Marquardt from 2005 to 2009, as the “girlfriends” of Playboy founder, Hugh Hefner.

Madison claims that issues arose around “our spinoffs and working with the same producer,” who she said “tried to pit us against each other and got in our heads.”

“It was stuff that had to do with our spinoffs and working with the same producer. I really feel like he tried to pit us against each other and got in our heads. So, that’s a shame,” she shared.

The producer was Kevin Burns, who co-created “The Girls Next Door” and worked on a spinoff starring Wilkinson, called “Kendra,” the year before Madison, Wilkinson and Marquardt all ended their runs on the series.

Burns then developed “Holly’s World” and a spinoff for Marquardt that wasn’t picked up.

In 2016, Wilkinson, 41, dragged Madison, calling her Hef’s “clean up girl.”

Years later, she criticized Madison again for rehashing their friendship on a podcast.

“Dude… it’s 2021,” Wilkinson commented on an Instagram post about Madison’s “Call Her Daddy” interview.

She added in a second comment, “Times have changed. I forgive and have kids to love and focus on.”