The singer, 40, looked sensational as she larked around in a tiny khaki bikini in the stunning location.
The ex Pussycat Doll sizzled in a fringed bandeau bikini top, with the addition of a gold body chain giving her sexy swimwear style some added pizzazz.
"Just waitin around for the plumber…😂☺️," she captioned one playful snap that saw her seductively leaning against the rocks of the waterfall.
The beauty revealed she was enjoying a shoeless walk through the rainforest in another Instagram snap.
"Barefooted thru this hike #truehawaiian," she quipped.
Other snaps showed Nicole reclining on the rocks as the water poured over her body.
Another more risky shot showed the Right There hitmaker standing directly beneath the flow of water with her arms out as it drenched her.
Earlier this year, Nicole told The Mirror that she vowed to be in the best shape of her life after turning 40.
She confessed: "Oh my God, I can’t even think about that number, I can’t even say it.
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