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They showed Katy Perry and Rihanna showing their shock as Psy took the stage. However, the show put in the subtitles stating that Rihanna was a Psy fan. However, it was revealed that she had put her thumbs up for the duo 2 Chainz.
The editors of the show had put the two different scenes together to make it look like Rihanna was putting her thumbs up for Psy.