Kim Richards Sober During 'RHOBH' Season Three: Where is Lisa Vanderpump?

Kim Richards is staying strong in her sobriety throughout filming on The Real Housewives of Beverly Hills season three.

Nearly three years since Richards' stint in rehab for alcohol addiction, the mother of four enjoyed a night out with her co-stars for a few drinks. However, she kept hers non-alcoholic.

On Aug. 15, Radar Online reported that the cast was out for a few happy hour drinks -- sans any cameras -- at West Hollywood's famous bar The Abbey. Richards and newbie Lisa Rinna sipped on Diet Cokes while everyone else enjoyed a few cocktails.

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"Kyle [Richards] was drinking wine," a source told Radar. "But Kim and Lisa stuck to Diet Coke. And believe it or not, it was a legit get together because there weren't even cameras there filming for the show."

Radar's source said Lisa Vanderpump did not join in on the fun, despite her latest venture, PUMP Lounge, being just a few steps away.

Although Vanderpump didn't join her co-stars for happy hour, Radar's source claimed she's having a much better season than she was last year -- and that's partially the result of her alliance with Rinna.

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"Lisa Vanderpump is going out of her way to make sure that she can count on Lisa Rinna this season," the source explained. "Last year, Lisa V. was left out in the cold as all of the ladies turned on her. Both of them have been social acquaintances for years, but Vanderpump is truly going the extra mile to welcome Lisa R. to the show."

What good is reality television without a bit of drama?