Yolanda Foster may reveal major secrets regarding Kim Richards' alcohol relapse during The Real Housewives of Beverly Hills season six.

Yolanda Foster Is Determined To Find A Cure For Lyme Disease, Claims Husband David

Although Foster and the rest of the cast had previously agreed to keep Kim's issues away from the cameras, Foster is said to be ready to "hit Kyle where it hurts" after learning she failed to defend her when Taylor Armstrong questioned her Lyme disease diagnosis.

“Yolanda is no longer going to abide by that,” a source told Radar Online on Monday of the cast's former decision to keep Kim's issues private. “She will accuse her of being a terrible sister for not being more there for Kim during her struggles. Yolanda has held a lot of secrets over the years, so expect the fireworks.”

Yolanda Foster's 'RHOBH' Co-Stars Question Her Lyme Disease Diagnosis?

Foster will film scenes “in the next week,” and "other cast members could be the target of her anger!”

While Foster was previously down and out over her Lyme disease struggles, she's since gotten slightly healthier after removing a leaky implant.

“Yolanda is now firing on all cylinders again,” added the source. “You don’t want to mess with her! She will use RHOBH to continue to raise awareness for Lyme disease, and finding a cure. She doesn’t want anyone else to go through the hell she has.”

The Real Housewives of Beverly Hills season six is expected to air later this year on Bravo.

Tags: yolanda foster Kim Richards kyle richards Bravo The Real Housewives of Beverly Hills Reality TV