The three were being filmed having a picnic lunch. After the meal, Richards carried a blanket out of the park, while Glanville had shopping bags in tow and Foster held onto a picnic basket.
A source close to Richards tells ET that producers called the 51-year-old reality star back to be a part of a few episodes.
“Everyone sees the progress she has been making and everyone was happy to have her back!” the source said.
Oddly, Glanville was sporting a blue tank top that said, "It's not fun to be sober," despite the fact that Richards has a history of battling substance abuse issues.
It isn’t a complete surprise that Richards is filming for RHOBH. While ET learned in June that she would not be returning as a full-time cast member, there was word that she would be making a cameo or two in the upcoming season, and she appeared in the recently released season six trailer.