Holly Madison's book was slammed by former Playboy bunny Izabella St. James. According to Daily Mail, the former housemate exposed the "humiliating acts" that the "Down the Rabbit Hole" author did just to please Playboy founder Hugh Hefner.

The New York Times bestseller exposed Holly Madison's alleged experiences while living in the Playboy mansion, which included rampant drug use, sexual perversions and abusive behavior.

However, Izabella St. James denied the claims made by Holly Madison in her book, saying the 35-year-old starlet's inaccurate tell-all is simply meant to get back at the pornography mogul who did not marry her.

"She is selling the book by making outrageous claims, and doing tell-all interviews where she says he degraded her and calls it the house of horrors," said the 39-year-old Polish stunner.

"If it was the house of horrors, she was the most willing and happy participant of it all."

Izabella St. James shot down claims in Holly Madison's book that she was forced to engage in sexual acts with the 89-year-old magazine founder.

"You are sharing his bedroom. You are sharing his bed everyday," she reminded Holly Madison.

"Whereas the other girlfriends return to their bedrooms, you have to have sex with him everyday, or when he wants."

The former Playboy Playmate even revealed how Holly Madison allegedly engaged in "humiliating sexual activities" that all the other girls declined to.

"She became useful to him because from the very beginning she was willing to do things that other girls were not willing to do," Izabella St. James claimed.

"We have seen her do some extremely humiliating things sexually and I think part of her bitterness and humiliation and vengefulness comes from that. It was very belittling and she was the only one who did that or had to do that."

"I think everyone looked down on it and looked down on her for having to be in that position. [But Hugh Hefner] saw the potential in having someone who was slavishly devoted to him," she explained.

Holly Madison's former housemate said the book is simply a result of the starlet's piled up resentments since Hugh Hefner did not marry her after all she endured for him.

"I believe that pathetic bitterness, vengefulness and meanness stems from her own unresolved humiliation," Izabella St. James said.

"I feel bad for her, but she never had to do it if it was so miserable."

"She stayed there for seven years. I left after two because I had more than enough, and I didn't have to do 10% of what her involvement with him was," she pointed out.