Prepare yourself: This is a video that'll make your hips hurt and then some. From her opening wavy mane, the smoldering temptress look, to the femme fatale and hot rocker-chick persona, it's clear Shakira's back in full Shakira mode. Rihanna's doing Rihanna and, unlike that other Shakira duet, sticks to twerking rather than try her hand at the aforementioned wall-hump move (seriously, what is that thing called?). Each ladies' beauty game is on par here, too. It's an effortless video meant to tantalize over anything else. And, that's a-okay. Sure, one can try and read into the subtle Britney Spears x Madonna "Me Against The Music" gender flip, but, honestly, the two look so effortless together that it's erroneous at this point.