"Real Housewives of Beverly Hills" returns in January 2015. And if new reports are true, it seems that the cast have become meaner to one another.

A recent report claim that the housewives are ganging up on fellow cast member Kim Richards. The reason? They think she has a drinking or drug problem.

An insider told Radar Online, "Things got extremely tense very quickly in Amsterdam because the ladies, led by newcomer Eileen Davidson, believed that Kim was under the influence of something."

"No one saw Kim drink or take any pills, but she did slightly slur her words during one of the initial outings on the trip," the source added.

If fans can remember, this wasn't the first time Kim was suspected of being under the influence. In season 3, Kim acted weird and slurred her speech during the cast's trip to Paris.

Meanwhile, other "Real Housewives of Beverly Hills" 2015 news speculate that Eileen and Yolanda are behind the scheme.

"Eileen was trying to stir things up behind the scenes, along with Yolanda [Foster], questioning Kim's sobriety," a source said.

Another "Real Housewives of Beverly Hills" 2015 report talks about Lisa Vanderpump's rumored departure from the reality show. In Vanderpump's interview with Inquistir, she revealed that the previous season was difficult, but denied speculations that she will not be coming back.

"There was a moment where I thought I just can never go back to that because it was so difficult.

"But...I'm awfully glad I did because I do think this is going to be our best season yet!"

Stay tuned for more "Real Housewives of Beverly Hills" 2015 updates here!