Never one to be outdone by young upstarts (we all know who), Rihanna ups the ante on twerk (and poledancing) with the video for Pour It Up, with herself credited as director. 

This follows a drama between herself and Vince Haycock, previously connected with this project: Vince's withdrawal led to a little twitter war involving Ri and her fans. But that was just the prelude to the main event: Rihanna's stab at being the naughtiest twerker of all.