One of the strippers who posed with Katy Perry inside a Santa Barbara strip club has been FIRED for violating the Cardinal rule ... taking pics of their encounter and making them public.
Cassidy, Katy, and other dancers posed for several photos ... TMZ obtained the pics and posted them a couple days later -- and management was pissed.
We're told Cassidy -- who has a child -- violated her club's "no cameras" rule by taking the photos and making them public and that's why she got canned.
