It’s emerged that Tom Cruise once hired celebrity private investigator, Anthony Pellicano, over fears that he was being followed.

Pellicano's top assistant, Lily LeMasters, made the admission in an L.A. courtroom yesterday as she tesified during the PI’s trial for running an illegal wiretapping and information.

According to PageSix.com, LeMasters claimed she overheard Pellicano and former LAPD Sergeant Mark Arneson discussing Tom's problem, and admitting they were "trying to find out who this license plate belonged to, because it's Tom Cruise."

It wasn't revealed who – if anyone – was following Tom. Any suggestions?