Scott Disick Out Of Control Before Clubbing with Kylie and Kendall Jenner

If Scott Disick was the responsible adult last night when he took 16-year-old Kylie and 17-year-old Kendall Jenner to a 21-and-over nightclub, Kris oughta be plenty worried, because he was off the hinges earlier in the night.

Scott was at a Style Fashion Week L.A. event earlier in the evening with Kylie and Kendall. He was drinking and acting belligerent ... to the point where one of the models (Caroline D'Amore) flipped him off.

At the end of the show (for the line Day By Day), Scott grabbed the designer, Cedric Benaroch, and almost pulled him off the runway.

Scott then started freestyle rapping for Lil Twist and a random guy, ending with, "I drive f**king Bentleys!"