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Rihanna

Reverse Cowgirl

4/28/2012 4:30 AM PDT BY TMZ STAFF

0427_rihanna_bikini_launch_v2Rihanna's up to her usual thigh jinks again -- showing off her tight gams during a quick trip to Hawaii Friday ... and single-handedly raising the temperature of the Pacific Ocean in the process.

Yee-haw.

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