Kim Richards Harry Hamlin Dirt All Made Up ... To Piss Off Lisa Rinna

EXCLUSIVE

Kim Richards Lisa Rinna FightKim Richards is great at creating drama on "The Real Housewives of Beverly Hills" -- and even better at creating stories ... TMZ has learned.

If you missed it ... Richards accused fellow cast member Lisa Rinna of hiding a family secret involving her husband Harry Hamlin -- prompting Lisa to do the whole shout, threaten, and shatter a glass thing the 'Housewives' do so well.

Fans have been speculating wildly about what dirt Kim has on Hamlin -- but we've learned she made the whole thing up just to get under Rinna's skin.

Production sources tell us the issue will be brought up again on the reunion episode -- and Kim will admit she created the whole story.

Fake or not ... it made for great TV.