Kardashian Family -- Sisters & Mom Dragged Into Porn Spoof

It's the closest thing to a Kardashian family sex tape you'll ever get ... a K-fam porn spoof -- and everyone from Kim to Kris ... and even Khloe are getting the XXX treatment.

TMZ has learned ... porn star Kiara Mia -- star of "Bra Busters 4" and "Shrimp Fried P****" -- is taking on the Kardashian fam in her directorial debut ... a parody of "Keeping Up with the Kardashians."

We're told there are no plans to mock Kim's infamous sex tape with Ray J in the film -- but a Ray-J-alike will make an appearance during a sex scene between not-Kim and not-Kanye.

A porn star playing a porn star -- doesn't get more meta than that.