Yolanda Foster's Lyme disease is pulled into question on tonight's Real Housewives of Beverly Hills.

'RHOBH' Yolanda Foster's Lyme Disease Bombshell: 'I Stopped All Treatments'

During Ken Todd's birthday celebration, Taylor Armstrong is seen chatting with Lisa Rinna about her doubts in Foster's diagnosis.

"What's going on with Yolanda? I'm so like confused," Armstrong explains to Rinna during a sneak peek at tonight's episode. "It seems strange that she's like, happy selfie, sick selfie, happy selfie, sick selfie, and also, I'm trying to follow her on Instagram, but I don't like seeing the whole needle-in-the-arm thing all the time. It's a little much."

Does 'RHOBH' Star Lisa Rinna Doubt Yolanda Foster's Lyme Disease Diagnosis?

In July, Radar Online reported on Armstrong and Rinna's interaction.

Armstrong “was openly questioning how sick Yolanda was,” an insider told the site. “Taylor said she was having major doubts about how serious the Lyme disease was for Yolanda, who wasn’t at the party. Lisa Rinna was openly seething with anger because Taylor doesn’t even know Yolanda, and shouldn’t have even gone there! It quickly became obvious to Lisa that Taylor is being brought back this season to stir the pot.”

After their chat, claimed Radar, Rinna "vowed to stay away from Taylor,” deeming the former housewife as a "huge opportunist.”

The Real Housewives of Beverly Hills season six airs Tuesdays at 9 p.m. on Bravo. Check out a sneak peek of tonight's show below.