Lisa Vanderpump and Kim Richards appear to have settled their differences.

Lisa Vanderpump Discusses The 'RHOBH' Season Five Reunion

Although the two women were at odds while filming the fifth season of The Real Housewives of Beverly Hills, they were together on Saturday night, as Richards celebrated her 51st birthday at PUMP Lounge in West Hollywood, Calif., and afterwards, Vanderpump shared the following message on Twitter:

Kyle Richards & Lisa Vanderpump Were Spotted Filming For 'RHOBH' Season Six

Following Richards' second arrest this year, her former co-star, Vanderpump, spoke to Us Weekly about her troubles.

"Well, I'm sorry Kim's not here because of the situation," Vanderpump told the magazine during her Hero Dog Awards Benefit Luncheon last month. "That's the thing. But I think her sobriety is more important than any reality show. And I think a lot of people recognize that fact and that's probably why she's not in this season."

Although Bravo hasn't officially announced Richards' rumored firing, she has yet to be seen filming with her co-stars.

Also in her interview with Us Weekly, Vanderpump admitted to reaching out to Richards after her first arrest in April, "but not since then."

"I'm not that close to Kim, obviously I'm closer to Kyle," she explained. "I’ve heard updates and stuff. But it's a sad situation."

For more Lisa Vanderpump, tune into The Real Housewives of Beverly Hills season six, when the show returns to Bravo later this year.

Tags: lisa vanderpump Kim Richards kyle richards Bravo The Real Housewives of Beverly Hills