Kyle Richards Kim Richards: 'RHOBH' Star Concerned About Sister's Sobriety [VIDEO]

Kyle Richards has reportedly grown concerned about her sister's efforts to remain sober.

'RHOBH' Star Kim Richards Has Been Hospitalized

Following a worrisome trip to Amsterdam earlier this month, Kyle and Kim reunited in Palm Springs, Calif., where the Real Housewives of Beverly Hills stars allegedly addressed a possible relapse suffered by Kim.

“Producers of RHOBH are finally getting the drama they wanted as filming winds down," a source told Radar Online on Oct. 22. “Kyle doesn’t want to believe that Kim has fallen off the wagon, but needed to spend time with her to talk about it. Naturally, cameras from the show had to be there to document it.”

Kim Richards Credits Her Sobriety To 'The Real Housewives Of Beverly Hills'

According to Radar, Kyle, Kim and the rest of the Real Housewives of Beverly Hills cast recently traveled to Amsterdam for a group bonding trip. However, the trip quickly turned dramatic when Kim exhibited some odd behavior. One source claimed Kim was slurring her words and acting strange, but another insisted she was simply tired and jet-lagged from traveling.

In Palm Springs, Kyle reportedly intended to get to the bottom of Kim's issues and set the record straight about her sobriety. Unfortunately, things didn't go as planned.

“Let’s just say after the weekend was over, Kyle had even more concerns about Kim’s sobriety," the source said. "There were tons of tears, and Kim got very defensive when confronted by Kyle about accusations she had indeed suffered a setback in her recovery.”

Kyle Richards and The Real Housewives of Beverly Hills cast are expected to return to Bravo for their series' fifth season later this year.