The sensational gig will see the surviving members of the grunge band together for the first time in 20 years.
And former Beatle Sir Paul will sing with them as they play a new song at a star-filled charity concert in New York.
McCartney, 70, has been secretly working with Foo Fighters singer Dave Grohl and bassist Krist Novoselic after a recent session at a studio. The pair were founding members of Nirvana along with Cobain, who committed suicide in 1994.
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