Rihanna, 22, was true to her word and threw Katy Perry, 25, a bachelorette party in Las Vegas over the weekend. The girls caught a Cirque du Soleil show and spent time partying in the pool at Hard Rock. Of Katy's relationship with fiance Russell Brand, Rihanna said, 'I met him a few years ago when he interviewed me, and became friends with Katy later, and it's so funny because I would never have put the two of them together. But when she told me it made so much sense. I was like, 'Of course you guys would be together, you are both just hilarious and rude and disrespectful, it's perfect.'" How...sweet.