Kim, Kanye and Kris Jenner arrived at a fashion show Thursday ... and several hundred people -- including a gaggle of photogs -- were squeezed in to watch them arrive.
As Kim gets out of the car, a guy lunges at her, tackling her legs and tries to pull her to the ground.
You see security jump in, subdue the guy ... and then quickly escort Kim and Kris into the building.
TMZ has learned the attacker may be Vitalii Sediuk -- the Ukrainian prankster who did the same thing to Leo DiCaprio, Brad Pitt, and Will Smith. According to his rep, Sediuk is taking credit for lunging at Kim.
He wasn't arrested on the scene -- but our Kardashian sources say the paparazzi actually turned on Sediuk and held him down while Kim was whisked away.