Kim Kardashian -- Call Me a Pill Popper and I'll Go After You

Kim Kardashian is telling friends she's totally klean ... and God help the tabloids that say she's a pill popper.

Our Kardashian sources tell us Kim is furious over a report in an Australian mag claiming she takes Valium and sleeping pills in dangerous amounts, and the family is alarmed. Based on what we're told, it appears Kim is not only Rx free, but she barely touches alcohol.

We've learned Kim has summoned her lawyers, who are about to fire off letters to the media outlets that report or pick up the Australian story ... saying they'll do so at their own peril.