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Kanye West performs during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Paul McCartney during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Chris Martin during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Billy Joel performing during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Bruce Springsteen performing during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Alicia Keys performing during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Rodger Waters performing during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Keith Richards performing during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Mick Jagger performing during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Eric Clapton during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Billy Crystal during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Blake Lively during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Jon Stewart during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Chelsea Clinton during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Adam Sandler during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Kristen Stewart during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Bruce Springsteen performs during '12-12-12 ~ The Concert For Sandy Relief' December 12, 2012 at Madison Square Garden in New York. (Getty)

Karlie Kloss & Joan Smalls attends '12-12-12' a concert benefiting The Robin Hood Relief Fund to aid the victims of Hurricane Sandy presented by Clear Channel Media & Entertainment, The Madison Square Garden Company and The Weinstein Company at Madison Square Garden on December 12, 2012 in New York City. (Getty)

Katie Holmes attends '12-12-12' a concert benefiting The Robin Hood Relief Fund to aid the victims of Hurricane Sandy presented by Clear Channel Media & Entertainment, The Madison Square Garden Company and The Weinstein Company at Madison Square Garden on December 12, 2012 in New York City. (Getty)

Olivia Wilde attends '12-12-12' a concert benefiting The Robin Hood Relief Fund to aid the victims of Hurricane Sandy presented by Clear Channel Media & Entertainment, The Madison Square Garden Company and The Weinstein Company at Madison Square Garden on December 12, 2012 in New York City. (Getty)

P.Diddy attends '12-12-12' a concert benefiting The Robin Hood Relief Fund to aid the victims of Hurricane Sandy presented by Clear Channel Media & Entertainment, The Madison Square Garden Company and The Weinstein Company at Madison Square Garden on December 12, 2012 in New York City. (Getty)