This week on the “World Chart Show”: We’ll tell you why Justin Bieber is being sued; why Rihanna says she “wanted” Chris Brown; and why Katy Perry is packing up her “spinning peppermint” bustier for good. We’ll also tell you which countdown star thought she’d be a one-hit wonder, which countdown stars saved a fan and we’ll run down the list of the Top 5 highest-paid celebrities under the age of 30. Plus, we take a look at the Top 3 scariest movies of all-time. And, in a World Chart Chat, Marina of Marina & The Diamonds tells us why she came up with her fictional group. That’s all part of the countdown of this week’s Top 20 songs on International Hit Radio.