Does Eileen Davidson believe Yolanda Foster is faking her Lyme disease?

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While a couple members of The Real Housewives of Beverly Hills have reportedly questioned the severity of their co-star's illness, Davidson claims there's no way Foster would lie about her diagnosis.

“I think that is just a bunch of BS frankly,” Davidson said during an interview with OK! Magazine on Wednesday. “I know for a fact that she is not faking it.”

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“I care very deeply about her, and I see her struggling. Her cycle is really happening and it continues. It’s hard to see your friend go through this kind of thing, especially in front of the cameras.”

While Foster has the support of Davidson, the same can't be said for Lisa Vanderpump, and a couple others, who have made allegations against their co-star throughout filming on season six.

“The ladies seemed to think Yolanda had become a hypochondriac, or was making herself sick from undergoing so many alternative treatments,” a source explained to Radar Online. “Yolanda was very, very upset and did indeed yell at them.”

Foster was diagnosed with Lyme disease in 2012, around the time the mother of three joined the Bravo reality show.

For more Eileen Davidson, tune into The Real Housewives of Beverly Hills season six, premiering on Tuesday, Dec. 1, at 9 p.m. on Bravo.