Kathy Hilton has an issue with one of the Real Housewives of Beverly Hills stars.

Kyle Richards Reaches Out To Kim On National Siblings Day

Although Hilton, the older half-sister of Kim and Kyle Richards, didn't reveal which woman she was referring to, she took to Twitter days ago, where she called someone "2 faced," and accused them of having a "forked tongue."

"I never dissed Housewives, I just don't like the 1 who people think is so lovely, she speaks w/ a forked tongue. 2 FACED!" Hilton wrote on Twitter last week.

'RHOM' Star Joanna Krupa Weighs In On Kim Richards' Arrest & Relapse

Although many fans believed Hilton's tweet to be aimed at Lisa Vanderpump, Hilton appears to be a fan. Not only have the two women been spotted together in recent years, Hilton has also been seen at two of Vanderpump's three restaurants in Los Angeles, SUR Lounge and Villa Blanca.

Hilton has also been seen with Richards' close friend, Brandi Glanville. In fact, Hilton celebrated Valentine's Day with Richards and Glanville this year, and Glanville later shared a photo of the three women online.

The only housewives Hilton hasn't been seen with are Lisa Rinna and Eileen Davidson. However, because of Rinna's close relationship with Hilton's sister, Kyle, it's hard to think Rinna was the two-faced woman Hilton mentioned.

Hilton's sister, Kim, is currently in rehab, addressing issues of addiction. Since her entry into the undisclosed facility, all of her co-stars have spoken out in support.

Below is what Vanderpump had to say.