hit up "Saturday Night Live" last night -- where she performed her new single "Where Have You Been."

While the sexy singer appeared in "Shy Ronnie" digital shorts during her past visits to the show, this time she just performed two songs ... steering clear of the show's skits.

Wearing a black crop top shirt, short skirt and two arms full of big bracelets, RiRi did a wild, backup dancer-filled performance of her new single -- where she even showed off some impressive moves of her own.

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