Does Lisa Vanderpump think Yolanda Foster is faking her Lyme disease? Lisa Vanderpump is unsure of Yolanda Foster's Lyme disease diagnosis. Why Does 'RHOBH' Star Yolanda Foster Spend The Majority Of Her Time In Bed? Although the reality star and restauranteur didn't come right out and say that her Real Housewives of Beverly Hills co-star was faking her illness, she admitted to having a few questions about the authenticity of Foster's diagnosis during filming on season six.