Khloe & French Back on Their Grind

11/5/2014 6:00 PM PST

Khloe Kardashian & French Montana -- Back on Their GRIND


Khloe Kardashian and French Montana got their naughty bits together again as she grinded all over him at her sister’s 19th birthday party ... making it clear they're reuniting. 

Oh, and the birthday girl -- Kendall Jenner -- got a lesson in crime and punishment!  Yeah, we're talking about a stripper cop.