Selena Gomez -- Mobbed in L.A. ... Scarier than a Stuck Elevator (VIDEO)

Selena Gomez caused a Bieberesque mob scene at LAX Friday ... just by walking from the plane to her car.

The video is hilarious ... paparazzi are falling over each other, clowning her about getting stuck in a Paris elevator.

And check out the fan who grabbed a smooch. She knows just when to turn the other cheek.