Glanville, 42, shared a photo Thursday of the blonde pals smiling from beneath stylish sunglasses while grabbing a meal in honor of Richards’ 51st birthday.
“Birthday lunch for my friend @KimRichards11 with the strong & Amazing @YolandaHFoster #realfriends,” Glanville tweeted.
In June, sources told PEOPLE that the none of the three women are returning to the Bravo reality show as regulars next season: Richards because of her struggle to stay sober, and Foster, 51, because of her ongoing battle with Lyme disease.
Glanville spoke about her departure with Howard Stern in July, skewering reports that she had been fired.
“I didn’t want to do the show again. I took so much heat,” she explained. “I was doing things to my own detriment that I couldn’t explain like throwing wine in someone’s face. I’m not sure why. But at the end of the day, I got so much hate on social media.”
Still, she said she’s be game for a cameo with her pals.
“I said, ‘Listen, I will come back if it makes sense – if it’s with Yolanda or if it’s with Kim,’ ” she told Stern of her conversation with producers. “Otherwise, I don’t talk to the other ladies, and I don’t like them.”
Meanwhile, Richards seems to have reconciled with her sister Kyle, who remains a main Housewife: She posted an Instagram of the siblings spending “quality time” together at her birthday dinner Sunday.