Momager Kris Jenner is going to have to do some major damage control!

The 61-year-old matriarch of the Kardashian/Jenner clan is terrified of what her former son-in-law Lamar Odom could reveal during his upcoming rehab stint. After being married to Khloé Kardashian for seven years, Lamar knows all of the family’s deepest, darkest secrets and any information revealed during group therapy sessions could hurt the Kardashian brand.

kris jenner kim kardashian khloe kardashian lamar odom

Lamar, “not only has all the dirt on Khloé, but he has firsthand knowledge of the Kardashian secrets that could bring the family down," a source exclusively reveals to Life & Style.

Khloé and Lamar’s whirlwind romance was one of the major storylines on the family’s long-running TV series Keeping Up with the Kardashians, and it even spawned the couple’s own spin-off show Khloé and Lamar.

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But even though their fairytale wedding was filmed for KUWTK, the couple still had its fair share of problems — mostly stemming from Lamar’s battle with addiction to drugs and alcohol, which eventually cost him his marriage and also led him to his near-fatal overdose last year. Khloé postponed her divorce from Lamar last fall until he fully recovered from his overdose, but since then, the divorce has been finalized and she’s moved on from their relationship.

khloe kardashian and lamar odom (getty images)
Gettty Images

But Lamar is continuing his road to recovery. On an upcoming episode of daytime talk show The Doctors, Lamar opened up about his near-death experience for the first time.

“I wasn’t in a good place mentally, especially mentally, before the incident happened,” he shared. “My wife at the time, we were going through some things. I was in a dark place.”

MORE: It's Been 1 Year Since Lamar Odom's Overdose — See How the Kardashians Reacted!

Lamar, who is currently checked into a 30-day rehab program, is scheduled to return to The Doctors after completing his treatment, and because he was so close with the family during all of their biggest scandals — from Scott Disick’s own battle with addiction to Kim Kardashian’s botched wedding to Kris Humphries — he has access to all of the information that his former mother-in-law doesn't want the public to know.

“Khloé and her mom are already discussing how to deal with the revelations,” the insider adds. “They’re fearing the worst.”

For more on Lamar’s recovery, pick up the latest issue of Life & Style, on newsstands now. And for a look back at Lamar and Khloé’s relationship, check out the gallery below!