Opting for a one piece, the singer shows off her svelte physique in a fiery plunging number while paddle boarding.
Bold beauty! RiRi sports a sexy cropped bikini bottom with a halter back top.
Cowboy hat on, the pop star shows some skin in a fringed bandeau bikini.
Donning a sleek animal-print bikini, the singer playfully sprays her pal with a hose.
Chevron prints and magenta shades make up this colorful bikini combo.
RiRi's tawny bikini blends seamlessly with her skin, making for an ultra-sexy (and barely-there) effect.
Look closely, and admire the sassy electric guitar print on her yellow string bikini.
Keeping with a blue theme, Ri covers up her high-waisted bikini set with a chambray top (also note those amazing sapphire shades).
Risqué! The pop star forgoes the the bandeau, and sticks with just gold bottoms.
Champagne in hand, she rocks a teeny gold bikini.
Whew! This cutout silver one piece may be her sexiest swimwear yet.
She covers up with a mesh skirt.
We like the star's multi-toned yellow and blush bikini top, but what we really girl are those mode petal-pink shades.
Hmmm… looks like Kendall Jenner took a page straight out of Rihanna's bikini handbook.
It's a stripped bikini combo for the edgy star.
She's St. Tropez chic in this a strap-free bikini top and sexy cut-out white midi.
No beach necessary! She's just as happy sporting a bikini in an oversized Jacuzzi tub.
We like the bikini top, but it's the layered jewelry here that steals the show.
Ahoy there! She's clearly channeling some Pirates of the Caribbean vibes for this sultry look.
Adding a lot pop of color to her white bikini, the pop star throws on a neon shirt wrapped around her waist.
It's a simple black halter bikini top for the songstress on her scuba diving adventure.
Rihanna puts her hair scarf to good sexy use—fashioning the bandeau into a makeshift halter bikini top.
The singer lets her body do the talking in this all-white halter bikini.