Exes Kris Jenner and Caitlyn Jenner are at war!

Caitlyn recently released her tell-all memoirThe Secrets of My Life — and Kris is not happy about it. Sources exclusively revealed to Life & Style that the 61-year-old momager is furious about the way she was portrayed in the book and is in the process of writing her own tell-all.

MORE: Kim Kardashian Talks North’s Jealousy During ‘Ellen’ Interview — “She’s Just Awful!”

“Kris has been working on a tell-all for years, but now she’s fast-tracking it because of the horrible press she’s getting,” the source told Life & Style. “Kris can be ruthless when she has to be, and she’s going to play as dirty as Caitlyn… Actually, she’s going to get even dirtier.”

kris and caitlyn jenner getty images

(Photo Credit: Getty Images)

The reality star recently expressed her anger over the book on an episode of Keeping Up with the Kardashians.

“None of it makes sense,” she said in a KUWTK clip. “Everything she says is all made up. Why does everything have to be that Kris is such a b—h and an a–hole?”

MORE: Khloé Kardashian Slams Breakup Rumors at Cavs Game — Proves She’s Tristan Thompson’s Biggest Fan!

But, Kris is determined to beat Caitlyn at her own game by writing an even juicier memoir. The mom-of-six wants to tell all the secrets of their marriage.

“She wants to name women and men that Caitlyn may have fooled around with,” the source explained. “It will shock readers… She’ll do whatever it takes to make her book outsell Caitlyn’s.”

For more on this story, pick up the latest issue of Life & Style, on stands now! Click through the gallery below to see more photos of Caitlyn!