'RHOC' Reunion Bombshell! Shannon Beador Claims She Has Proof Brooks Ayers & Vicki Gunvalson Lied About Cancer -- What She Brought To The Taping

Shannon Beador stood by Vicki Gunvalson's side all season on The Real Housewives of Orange County as the other women questioned Brooks Ayers' cancer diagnosis. But shockingly, RadarOnline.com has learned that Beador came armed and dangerous to the reunion taping -- with a document she claimed proves Brooks Ayers is faking his cancer diagnosis!

According to an insider, Beador secretly went to the clinic in Newport Beach where Ayers claimed he had undergone a PET scan. And although she's in perfect health, she got a scan herself!

"Shannon brought her report from the clinic to the taping of the reunion and pointed out glaring differences from what Brooks had given to Tamra Judge to review on camera," the source told RadarOnline.com. "The letterhead was completely different, along with the spacing."

In addition, the source said, "Shannon also pointed out that she specifically asked if her report reflected a universal format used by the clinic for all patients, and she was told it did. In her mind, this was the only proof she needed to prove Brooks was lying about his cancer diagnosis."

When she unleashed her claims at the reunion, "Vicki was stunned!" the source said. "She really had nothing to say about the differences between the report."

As RadarOnline.com reported, Gunvalson and Ayers had previously asked Judge to review a medical report, and inform the other ladies it confirmed his cancer diagnosis.

However, the plan backfired after it raised more questions and caused major drama.

Meanwhile, the other ladies "pounced on Shannon's claims," the source said. "Tamra felt betrayed by Vicki, and was setting her up to lie for her. Heather Dubrow was especially disgusted, accusing Vicki of looking the other way while Brooks lied about the cancer diagnosis."