Rihanna Workin' the Pole ... In a Bikini

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Here's Rihanna ... bent over a pole while wearing a tiny bikini ... in a series of hot poolside photos she just took while hanging out in Greece.

There's not really much more to say ... so, we'll just go with "Ef̱charistó̱" ... which, we're told, means "thank you" in Greek.

Enjoy!