Khloe Kardashian's Birthday Gift From French Montana -- Rapper Drops a Load

French Montana has only been with Khloe Kardashian for a few months ... and he dropped nearly $100,000 on her birthday presents.

French got Khloe a Jeep Wrangler Sahara, which we're told cost around $50K.

But wait. There's more. He also gave her a $25,000,18k gold ring with natural green Colombian emeralds and natural yellow canary diamonds from Rafaello & Co.

And still more. French gifted her 2 grills (one with diamonds and one without) at a cost of $10K. Khloe wore one to her birthday bash.

Love ... it don't come cheap.