Jennifer Aniston's Neighborhood Besieged

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.