Rihanna knows how to make a splash no matter what she's doing ... and going topless while vacationing in Hawaii is just another example of her wild ways.

The "Umbrella" singer, who just returned from a weekend at The Coachella Music Festival, is sharing these personal and provocative photos from her tropical getaway.

Tiny bikinis, lots of skin and licking her lips! Nothing like laying it all out there for the world to see.

That's why we absolutely love RiRi!