And that person is Kyle Richards.
Richards took to her Bravo blog on Wednesday to address Foster's suffering and reveal just how hard it has been for her to see her friend in so much pain.
"Watching Yolanda in the state she is in is very sad. She's been suffering for so long now and has tried so many different treatments with very little (if any) relief," Richards wrote. "Seeing Yolanda cry is heartbreaking. I've always seen her as being so strong that I am always taken aback when I see her so down and weak. You can feel how much she is suffering."
Foster has struggled for years with Lyme disease (after being diagnosed in 2012), and Season 6 of the show will give fans further insight into her struggles, including how it affected her marriage to David Foster.
Richards concluded her post with the mention that it is not just Foster's challenges that will be shown on the season. She wrote, "This season is very challenging for many of us. You will see many ups and downs between all of the women. It's not always easy having certain parts of our lives out there, especially while going through difficult times. This is just the beginning...."
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