Joan Smalls and her sister Erika have been chosen by Balmain designer Olivier Rousteing to star in his sisters campaign showcasing the brand's Fall/Winter 2015 collection. Erika, who is a social entrepreneur, is not usually in front of the camera or walking the runway like her sister [1], but it takes just one quick look at the picture above to know that great modeling genes run in the Smalls family; both Puerto Rican beauties look totally natural and comfortable — not to mention supersexy and fierce.

Joan showed her excitement for the ad on her Twitter [2], saying: "Smalls Sisters Attack @Balmain @ORousteing Huge Thanks this is Epic. I have goosebumps, so beautiful @_ErikaSmalls." Erika chose Instagram [3] to say, "there are no words to describe how I feel right now. Can't stop smiling, dancing & hi-fiving [sic] random people. It was a pleasure and memorable experience working with everyone on set! I am deeply grateful for this opportunity." The pair is in good company with other ads for the campaign [4] featuring Gigi and Bella Hadid and Kendall and Kylie Jenner.