Cops Run Internal Investigation Over J-WOWW

A "Jersey Shore" star is at the center of an internal police investigation in New York, this according to law enforcement.

TMZ has learned the Nassau County Police Department is looking into a tip they received regarding access to J-WOWW's personal information.

It's unclear who or what investigators are looking into -- but cops did confirm that the investigation began after someone filed a complaint on J-WOWW's behalf.

So far, no comment from J-WOWW's people.