Who's been listening to Simon Cowell's car?

"American Idol" judge Simon Cowell is reportedly "freaked out" after a very sophisticated tracking device was found attached underneath his car.

Cowell asked his security team to search the Bentley Continental after noticing that a biker dude kept showing up wherever he was, reports the Mirror.

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

And very "Bourne Identity."

"Simon has his suspicions as to who is responsible," the source told the Mirror. "He is so angry he is considering calling in the police to investigate further."

He is also expected to get all the rooms of all his homes swept for covert listening equipment.

Yikes. I should think so. Wonder who he suspects ...?

As well as being able to track him, heaven only knows what conversations listening devices could pick up.

Imagine what Simon has been saying -- and to whom -- in the privacy of his own car or home!

In a way, it's too bad he found it. We could have found out next season's possible winners ahead of time.

Oh, c'mon, you know he talks about that stuff ....

Photo: WireImage