In what might be the world's first subtwerk on record, here's Rihanna twerking to Drake's verse on A$AP Rocky's "F*ckin Problems". Not sure how Chris Brown is gonna feel about this, but if he could take the first swing at the annoying chick who keeps saying "Ah. Ah. Ah. Ah." like some damn racthet parrot, that would be fantastic. Mostly because it distracts from Rihanna' ass bouncing. But not for Miley. She'll be practicing this with her choreographer later.