What is a snitch? Who tips off the paps about celebs? Well...

Here's a bald pap (R) from National Photo Group checking in with his old grizzled snitch outside a Los Angeles area Starbucks, no one tell the snitch he missed TWO celebs in one hour, but we guess it's the thought that counts. But snitches come in many shapes and forms, and could be, say, a guy who runs a cell phone accessory cart at the Commons in Calabasas...or something like that...

Is this who is harassing Alyssa Milano at her yoga class?

Alyssa Milano says a pap who drives a gun metal grey Toyota Camry with no plates is harassing her at her yoga class and he's from NPG, National Photo Group...