Pippa Middleton, the sister of Kate Middleton, was in the passenger seat when the driver of a convertible pulled out what appeared to be a semi-automatic pistol and pointed it straight at photographers.
The incident could send Pippa smack into the center of an embarrassing police investigation -- and even possible prosecution.
Although it's unknown whether the gun was real or fake, it could still result in serious legal trouble. Under French law, even using a fake weapon to intimidate someone carries a sentence of up to two years in prison.