Things keep getting worse—and weird—for Simon Cowell.

The grumpy, 49-year-old American Idol host—who recently split with his longtime girlfriend, 34-year-old Terri Seymour—is "completely freaked out" from having found a tracking device attached to his Bentley Continental, the Daily Mail reports.

Cowell's suspicion was first aroused when he noticed the same motorcyclist turning up like a bad clam wherever the Bentley went.  Irritated, Simon called in his security professionals (naturally Simon Cowell needs security professionals), who discovered the "quite sophisticated" device.

"Someone has gone to much trouble and expense to monitor his every movement. It's extremely sinister," says a source close to the TV host.

Cowell believes he knows who the culprit may be.

"Simon has his suspicions," the source continues. "He is so angry he is considering calling in the police to investigate further."

The cops will have their work cut out for them. There's probably no end to the list of people who'd like to obtain some inside dirt on Cowell.

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