The `California Gurls` hitmaker - who is engaged to British funnyman Russell Brand - envies her pal’s curvy figure so much, she wants her to show it all off in a raunchy dance at her all-female pre-wedding party. When asked how much she wants Rihanna to show, the singer replied: "The whole bit, the whole bit. "She`s gonna get the message - she`s hot I love her and she`s the coolest chick and I want all of her curves and we have a lot in common." The singer also admitted Rihanna put herself in charge of organising the evening without even having to be asked. She told Chicago’s Kiss FM radio station: "That`s the one thing I don`t have to plan and I`m really excited about it." Rihanna has given the couple her blessing in the past - but also admitted she never thought the pair would end up together. She 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.` "