Jennifer Aniston -- Photog Swarm Is Crippling Neighborhood

Jennifer Aniston's neighborhood has been thrown into complete disarray -- traffic congestion, fender benders, loud noises, arguments -- and we're told ... it's all over Jen.

According to sources, once the actress moved into her Hollywood Hills home this summer -- crazed photogs have descended on the surrounding community like a plague of locusts.

We're told the paps have been stirring up constant mayhem for weeks -- creating traffic problems, blocking driveways, and even causing a few minor car accidents ... and the neighbors have had enough.

We're told several complaints have been filed with the LAPD about the unwelcome guests -- and in response, cops have drastically increased their presence in the surrounding areas, trying to keep the peace.