Breaking Now: ET reveals shocking news regarding Kevin Federline.

ET has several reliable sources that say the FBI and LAPD are investigating legitimate leads on a contract hit on KEVIN FEDERLINE's life.

Multiple sources tell ET that the FBI made attempts to contact Federline to inform him of the potential danger.

Sources within the FBI tell ET that this is the bureau's standard operating procedure when someone's life is threatened.

ET has been working this story for the past two months. When contacted, the FBI told us that the bureau cannot confirm or deny an investigation.