Rihanna, Kanye West + Paul McCartney Perform ‘FourFiveSeconds’ at 2015 GrammysRihanna, Kanye West + Paul McCartney Perform ‘FourFiveSeconds’ at 2015 GrammysOne of our favorite moments of the 2015 Grammy Awards? Oh, just Rihanna, Kanye West and Paul McCartney absolutely slaying their performance of 'FourFiveSeconds.'Michelle McGahanMichelle McGahan