Madonna

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Madonna was joined by Korean pop star PSY during a show at Madison Square Garden on Tuesday.

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** FILE ** Madonna performs on her "MDNA" tour at the Staples Center in Los Angeles on Wednesday, Oct. 10, 2012. (John Shearer/Invision/AP)

** FILE ** This Oct. 10, 2012 file photo shows Madonna performing on the "MDNA" tour at Staples Center in Los Angeles. Some Colorado fans are upset after music superstar Madonna used guns during a performance. Madonna started her show Thursday, Oct. 18, at the Pepsi Center in Denver with a gun scene, which she has used in previous performances. (Photo by John Shearer/Invision/AP, file)

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Madonna returned to the U.S. on Tuesday after a European tour and told the audience in Philadelphia that they should “never forget how lucky you are to live where you live and to have the freedom that you have.” (Keystone via Associated Press)

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Madonna (center) performs at Olympic Hall in Moscow on Tuesday, Aug. 7, 2012. (AP Photo/Mikhail Metzel)

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In this photo taken with a cell phone, Madonna performs Aug. 7, 2012, during her concert at Olympic Hall in Moscow with the words "Pussy Riot," the band name of three feminist Russian rockers on trial for performing a "punk prayer" against Vladimir Putin, scrawled on her bare back. The singer has voiced hope that the three women are released soon. (Associated Press)