The young, rich and famous certainly kept local cops busy in Calabasas, Calif., yesterday. First they caught Justin Bieber blowing through a stop sign and driving without a license, and then Kylie Jenner proved that even licensed drivers can wreak havoc when she caused a three-car crash later in the day.

Sixteen-year-old Kylie's had her license less than three weeks, but because she's a member of the Kardashian/Jenner brood, she drives a $125,000 Mercedes SUV (what, you thought she'd be in a hoopty like the one you had at 16?). It must be fairly sturdy, though, because even after she rammed the back of a Toyota -- causing it to rear-end a Subaru -- it was still drivable.

Witnesses say right after the crash happened, Kylie jumped out of her ride, immediately apologized and asked if everyone was okay. Cops showed up later but by then, she'd already exchanged info with the other drivers and left.

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