Rihanna -- Balls Out in Barbados

Here's Rihanna in Barbados ... kicking a soccer ball in her teeny, tiny, Rihanna-sized bikini.

Barbados Fun Fact -- Soccer is NOT the most popular sport in the country. According to the Internet, which is almost always accurate, Bajans LOOOOOVE cricket -- they're obsessed with it.

If you're unfamiliar with cricket ... it's like baseball with sweaters. Also, the fights are better in baseball. Need proof? Here's Nolan Ryan beating up Robin Ventura. Enjoy!