Simon Cowell's stalker terror

Dec 1, 2008, 9:35 GMT

Simon Cowell - The \'American Idol\' judge called his full-time security team in to investigate after he noticed a mysterious motorcyclist - clad in a crash helmet and leathers - kept appearing outside the buildings where his meetings were being held. © Janet Mayer / PR Photos

Simon Cowell is "completely freaked out" after discovering his car had been bugged.

The 'American Idol' judge called his full-time security team in to investigate after he noticed a mysterious motorcyclist - clad in a crash helmet and leathers - kept appearing outside the buildings where his meetings were being held.

After experts swept his £140,000 Bentley Continental, they discovered the tracker magnetically attached to the vehicle's undercarriage.

A source said: "Simon is completely freaked out by this. He can't believe someone has gone to so much trouble and expense to monitor his every movement. It's extremely sinister.

"He was aware that someone kept turning up a few minutes after he went everywhere. He couldn't work out how that person knew his movements.

"The tracking device was quite sophisticated and could have been used by the security services."

The 49-year-old star believes he knows who could be following him and may even take legal action them.

The source added to Britain's Daily Mirror newspaper: "Simon has his suspicions as to who is responsible. He is so angry he is considering calling in the police to investigate further.

"It is a hassle he could do without - especially with 'The X Factor' in its final stages - but it has to be done. He can't take any chances."

The incident comes months after a listening device was discovered under a table backstage at the music mogul's reality show 'Britain's Got Talent' earlier this year.