PHOTO: Rihanna finger her pussy

 You tell yourself she can't shock you anymore...and then she does something even more outrageous! Rihanna posted this very provocative photo on her twitter page with the caption 'School. Kills.' At first look you don't see the big deal...until you look closely. The skirt is transparent and you can clearly see that she's touching herself down there. See up close photos after the cut...