Ronda Rousey Poses ... For S.I. Spread

Ronda Rousey's confidence is back to champion form, and TMZ has the hard evidence -- Ronda sporting NOTHING but body paint on a Caribbean beach!

The ex-UFC champ is doing a photo shoot for S.I.'s Swimsuit Issue on Petite Martinique island, off the coast of Grenada. We checked, and what looks like a swimsuit ... is just paint.
As you can imagine, Ronda's shoot on a public beach drew plenty of attention ... hence these pics.
One thin layer of paint -- and several thousand miles -- is all that's standing between you and Ronda. Enjoy!
tmz