Hey pilots, Big Brother 3 is watching you.

The producers of Big Brother 3 will have several "plane-spotters" on staff this summer to keep an eye out for small airplanes dragging large banners with personal messages to the show's contestants. 

"If we see a contestant looking up at one of those banners this season, it could end up getting them expelled from the house," Big Brother 3 executive producer Arnold Shapiro told The Post

The plane spotters, equipped with radios will be situated somewhere near the Big Brother house and will radio ahead to producers if one of the banner planes seems to be headed for Big Brother airspace. 

"We'll know when they're about a mile out," Shapiro said. If the show's contestants are outside the house in its walled-off backyard, they'll be asked to go inside without looking up. 

Last year, several planes dragging banners with cryptic messages for the house-guests made it impossible to enforce the show's biggest rule: no contact with the outside world. 

One banner appeared to be an angry note from a contestant's husband after she'd been seen on national TV in a hot-tub getting frisky with several of the guys in the house. 

Like its two previous seasons — and countless versions around the world — Big Brother 3 will lock 12 contestants in a house crammed with video cameras and mics for the most of the summer.

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