WATCH: Rihanna goes shopping in swimsuit

MONACO - Rihanna went shopping in Monaco Friday, purposefully forgetting what most people consider to be a key wardrobe item - her pants.

Known for her risque outfits, the 25-year-old singer was seen in a shopping center in Monte Carlo donning a black one-piece bathing suit with a sheer top over it.

The high-cut swim suit is actually a custom item for the starlet, by New York City designer Matthew Zink. The suit has rhinestones in the shape of an "R," strategically placed at her lower back.