Alison Brie is demanding dozens of private, stolen, nude images be scrubbed from a celebrity porn website ... or else.

Brie's legal team fired off a stern letter this week to CelebJihad.com – the celebrity nudes website hosting the images – demanding the site immediately remove the actress' photos.

In the letter, Brie's attorney claims she owns all rights to the stolen materials and the website's publication of the images violates the "Glow" star's copyright.

The material in question includes an image published on Celeb Jihad back in April, as well as dozens of other photos posted this past August.

The cease and desist presented a pretty clear ultimatum: either immediately delete the images or Brie will "take whatever action she may deem necessary."