Lady Gaga | 2012

Lady Gaga joins Mick Jagger, center, and Ronnie Wood of the Rolling Stones on stage at the Prudential Center in Newark, N.J., on Dec. 15, 2012.

( Evan Agostini / Associated Press )

Lady Gaga joins Mick Jagger, center, and Ronnie Wood of the Rolling Stones on stage at the Prudential Center in Newark, N.J., on Dec. 15, 2012.

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