RIHANNA POST BIKINI PICS ON TWITTER & TELLS KHLOE KARDASHIAN TO "COME TAP THIS"

Rihanna continues to show off her crazy bikini body -- and striking some extremely provocative poses while doing it!

The 23-year-old singer posted more swimsuit photos on her Twitter yesterday while vacationing in Hawaii, this time doing some sexy poses while on workout gear, laying out on a towel and photographing a friend's posterior.

It's clearly all in good fun, as she tweeted "Come tap this" to Khloe Kardashian with the workout pic and "Strike a pose" with another.

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