Kendra Wilkinson called Holly Madison "irrelevant" and "a failure" during a recent interview with People. According to the report, past co-workers are allegedly laughing at the former "Girls Next Door" star.

Kendra Wilkinson and Holly Madison's feud began after the latter recently released a tell-all book entitled "Down the Rabbit Hole." The memoir revealed the alleged rampant drug use and politics inside the Playboy mansion, accused Hugh Hefner of being manipulative and labeled Kendra Wilkinson as fake.

Soon after the details were released, Kendra Wilkinson fought back at Holly Madison to defend herself and Hugh Hefner. The mother-of-two even pointed out how she also came out with a memoir in 2010 entitled "Sliding Into Home," but did not focus on any negative experiences about their time inside the Playboy mansion.

"My intention was to tell my story," the wife of Hank Baskett said about her own memoir.

"It's pretty sad. It makes you question the timing, and it makes you wonder, 'Wow, she wants real revenge.'"

"At the end of the day, true colors shine," added the 30-year-old reality star said about her former co-star.

Aside from Kendra Wilkinson and Holly Madison, former Playboy Playmate Bridget Marquardt was also part of their reality show.

Kendra Wilkinson also reiterated that Holly Madison is simply seeking revenge due to failed expectations with Hugh Hefner.

"The one thing she truly wanted was a piece of that stock, a piece of Playboy and a piece of Hef's will," Kendra Wilkinson said.

"She considers herself a failure because she did whatever it took to get that and she didn't get what she wanted in return. Hef is the most amazing human being."

The "Kendra on Top" star also revealed that former workmates from "Girls Next Door" who know the truth are now laughing at Holly Madison's supposed "expose" about life inside the Playboy mansion.

"Behind the scenes, people that actually know the truth are laughing their asses off," she said. "This is not even real. This person is out for revenge."