Rihanna threw Katy Perry one helluva bachelorette party in Sin City this past weekend. Rihanna, Katy, and 25 of their closest friends sipped champagne poolside at the Las Vegas Hard Rock, watched Cirque Du Soliel’s KA show at MGM, partied and danced at XS in Encore, then finished the night getting lap dances at Sapphire. All that sounds like fun, but the real icing on the cake was Katy’s naughty bachelorette cake (NSFW) chosen personally for her by RiRi! The cake looks circumcised to me, but Russell Brand is British. Do you think it anatomically matches Russell’s junk? I don’t think Rihanna did her homework. HA!