Rihanna Makes It RAIN on Stripper Throw It Up, Throw It Up!

4/24/2013 7:00 AM PDT

STRIP CLUBS AND DOLLAR BILLS!!! Rihanna sings from experience ... because last weekend in Miami, she dropped $8,000 on stripper booty -- and we got video.

Sources at Miami's mega-strip joint King of Diamonds tell TMZ, RiRi stopped in early Sunday morning, and rained down eight grand on several dancers, including a girl named Remy Redd ... one of the biggest strippers in KOD (in more ways than one).

We're told Rihanna dropped by to see how the girls move to her music -- and ended up staying for two-and-a-half hours. 

The video is insane. Watch it all fall out.