The 'Tiger King' star's been cashing in doing Cameo vids for a bit now, but her latest submission -- a birthday shout-out to a fan named Charlotte -- is ... well, priceless.

Carole -- joined by her husband Howard -- kicks off the video message with her tagline, "Hey all you cool cats and kittens," before saying they're "here with the crip mates" to wish Charlotte a happy bday.

And, then it gets REALLY interesting.

Watch for yourself ... pretty sure 50 Cent's "In Da Club" has never been done like this. And it probably shouldn't be ever again.