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Kim Richards is being cut off!

Big sister Kathy Hilton has stopped all financial help after the Real Housewives of Beverly Hills star, 50, fell off the wagon at her daughter’s wedding, RadarOnline.com can exclusively reveal.

Hilton has supported the former child star for “the last several years, after Kyle stopped paying for a majority of their sister’s bills,” the source explains. “After Kim relapsed at Brooke’s wedding, Kathy realized that she was enabling the behavior.

“There will no longer be any money going to Kim from Kathy.”

The monthly support ranged from $5,000 – $10,000, the source adds.

Radar broke the story: Kim Richards finally resurfaced in Los Angeles after exhibiting erratic behavior at her daughter’s wedding in Los Cabos, Mexico, on May 23.

Though the source says that Richards initially refused to go back to rehab, insiders tell Radar she checked back into a treatment center on Monday.