Lynsie Lee -- Post Cory Booker Strip Session ... Business (Not-So) Booming

Cory Booker's stripper friend did what she knows how to do best last night -- took off her clothes ... and we got video of her first show since being outed for flirting with the Newark mayor.

Lynsie Lee -- the stripper of the hour -- returned to the stage last night at the vegan strip joint she just made famous ... Casa Diablo.

Lynsie looked smokin' ... but her non-scandalous scandal didn't do much for business.

The good news -- we hear the vegan "Booker Burger" is delicious.