By Breaking Celebrity News Staff

According to a shocking new report, Kim Kardashian has a growing pill popping habit that has her sister Khloé is concerned -- and putting her foot down -- and Breaking Celebrity News has all the details for you.

"She's freaking everyone out right now," an insider told Australia's NW magazine. "She's taking Valium and sleeping pills. The last time she self-medicated was when she split from Reggie Bush two years ago, when everything felt impossible.

"Khloé's really freaked out by it: she found a bottle of pills and knew straight away what Kim was doing."

The insider -- calling Khloé "the queen of tough love" -- said the wife of Lamar Odom has issued sister Kim a non-negotiable ultimatum: get clean in three weeks, or she's telling both their mother Kris Jenner and Kim's current beau, Kanye West.

The fashionista, 31, began the self-destructive behavior, the insider told the magazine, as pressure mounted in the wake of her public split with ex Kris Humphries , and a nonstop work schedule.