Octomom -- I Think My Mail Lady Is Spying on Me!

Octomom believes her mail lady isn't just delivering the mail ... she's delivering information about her to other people ... and Octo wants her fired for it!

Octo's rep tells TMZ her security caught the mail lady snapping pics of Nadya's car and home on Thursday. She says security confronted her and she claimed she was taking pics of the car because she wanted one for herself.

Octo and her security team didn't buy the woman's story, so Octo filed a complaint with the Palmdale Postmater for violation of privacy. Octo tells TMZ she believes the mail lady has been giving out her address and says she's noticed an increase in traffic in her neighborhood as of late.

Octo tells us, "I am so shocked by the behavior of the USPS, now I know how people have been getting my address. It is very disturbing that this woman is handling my personal mail and possibly taking pictures of that as well. I certainly hope they are going to take this situation seriously. It is disgusting."