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LOS ANGELES, CA - FEBRUARY 08: Paul McCartney, Rihanna and Kanye West perform onstage during The 57th Annual GRAMMY Awards at the STAPLES Center on February 8, 2015 in Los Angeles, California. (Photo by Kevin Mazur/WireImage)

LOS ANGELES, CA - FEBRUARY 08:  Paul McCartney, Rihanna and Kanye West perform onstage during The 57th Annual GRAMMY Awards at the STAPLES Center on February 8, 2015 in Los Angeles, California.  (Photo by Kevin Mazur/WireImage)