Rihanna is putting one of her pals to work, work, work, work, work ...
having a woman come over and rub her famous backside down with whipped oil body cream from her own brand. The singer-songwriter appeared in a quick clip posted to a pair of Fenty Instagram accounts ..
. lying on her front in bright pink lingerie -- when a feminine hand dips into a small cannister of Fenty Skin Butta Drop Whipped Oil Body Cream and goes to town on RiRi's booty. Check out the vid .
.. Rihanna gets a pretty thorough rub on her exposed cheeks -- and, the video even slows down to give Fenty fans a good look at the jiggle.
In the caption, Rihanna pushes the Butta Drop and the Lavish Lace collection lingerie she's wearing ...
a 2-for-1 sales pitch. Rihanna's pushed her Fenty lingerie hard in recent weeks ..
. regularly stripping down to near-nothing to impress prospective buyers. BTW .
.. fans are loving the marketing ploy in the comments, with some saying they'd give anything to be the person charged with rubbing Rihanna down.
A tub of the Butta Drop costs about $25, depending on where ya shop ...
and, it'll get your butt shining bright like a diamond, just like Rihanna's..