Lisa Rinna was taken aback by Kim Richards' behavior on Tuesday night's episode of The Real Housewives of Beverly Hills.

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Following an eventful poker night, in which Brandi Glanville and Kyle Richards engaged in a physical altercation, Rinna took to her Bravo blog, where she gave her thoughts on Richards' strange behavior.

"I knew the night was going to be a wild one when I saw how Kim was behaving when she arrived at my house before heading to Malibu," Rinna wrote on Tuesday. "She asked to use the bathroom and was acting as if she was high on something, which is why I asked her if she had been drinking or was on drugs when we got into the car."

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According to Rinna, she's been around Richards many times, and said she's always been "light, fun and easy." However, during poker night, Rinna said she saw a very different Richards, stating she was "unpredictable" and "aggressive.

"The part that’s really hard was to watch Kyle realize with both fear and confusion what was going down in front of her own eyes," Rinna said. "Kyle is no stranger to this complicated road she’s been down before with Kim, and I know what a deep relationship the two sisters have, so I really feel for her."

On the show, fans were led to believe Richards, whose struggled with addiction issues for years, may have relapsed. In her own blog, Richards denied any such thing.

For more of Rinna and the rest of the cast, tune into The Real Housewives of Beverly Hills on Tuesday nights at 9 p.m. on Bravo.

Tags: Lisa Rinna Kim Richards The Real Housewives of Beverly Hills Bravo Reality TV