Yolanda Foster wishes Kim Richards a happy 51st birthday earlier this week on Instagram.

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As she contines to film the sixth season of The Real Housewives of Beverly Hills, Foster shared her well-wishes for Richards, as well as a photo of the two women posing together.

"Happy birthday @kimrichards11 I pray that each day, Love, Health and Happiness will come your way...... #RHOBH #Club51," Foster captioned the Instagram photo on Sunday.

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A photo posted by YOLANDA (@yolandahfoster) on Sep 19, 2015 at 1:51pm PDT

In response to Foster's birthday wishes, Richards told her former co-star, "Thank you. I'll see you next week!! Love u."

Because filming is currently underway on The Real Housewives of Beverly Hills, Richards' comment quickly led to speculation of her possible return. However, at this point, Richards is not expected to be featured on the show due to her multiple arrests and alcohol relapses earlier this year.

In June, a source told Radar Online, “[Bravo] decided that it was time to let her go because there was a lack of communication, and they are glad to see her go. Finally, they can no longer be held accountable for her misconduct.”

Although Foster was rumored to be leaving the show, as well, due to her Lyme disease, she has since been photographed filming with her co-stars.

For more Yolanda Foster, tune into The Real Housewives of Beverly Hills season six, which is expected to premiere later this year on Bravo.