Kris Humphries ex-girlfriend, Myla Sinanaj, is reportedly planning on writing a tell-all book that exposes some of Kim Kardashian's darkest secrets. A source told Radar Online that Sinanaj has already begun writing the book and "it's going to be juicy."

The source claims Sinanaj first learned about some of Kardashian's secrets once she started dating the reality star's ex-husband Kris Humphries. Reportedly Humphries would bash Kardashian in front of Sinanaj. The model was also called as a witness during Kardashian's divorce trial to the NBA player.

Sinanaj has ranted on Twitter about the "Keeping Up With the Kardashians" star in the past claiming that she helped her cheat on Reggie Bush and Humphries with Kanye West. During two separate Twitter rants, Sinanaj said when she was a manager at the W hotel Kardashian would ask her to make extra copies of her room keys so the rapper could sneak up.

Kardashian has never responded to these allegations and it's not clear how true they are. Kardashian has been accused of cheating in the past when Amber Rose said Kardashian was the reason she split with West.

"The last year and a half have been so insane and Myla really wants the truth of what happened to be out there," the source said. "She's been waiting to do this for a long time."

"Myla's telling everything," the source continued. "She's going to include all the legal documents, subpoenas that she got from Kim, and even her wedding invitation," the source continued. "For the first time, she's going to tell the world about the tricks that Kim tried to pull during her divorce."

The source also hinted that Sinanaj wants to talk about Kardashian and how she used to bash him before they got together.

"Myla has so much dirt on Kim and she's already gotten interest from some publishers about the book," the source said. "Kim should be scared!"