Madonna

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Madonna, left, introduces Maria "Masha" Alekhinaand and Nadezhda "Nadya" Tolokonnikova, right, of Pussy Riot to the stage Amnesty International's "Bringing Human Rights Home" concert at the Barclays Center on Wednesday, Feb. 5, 2014 in New York. (Photo by Evan Agostini/Invision/AP)

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Madonna participates in Amnesty International's "Bringing Human Rights Home" Concert at the Barclays Center on Wednesday, Feb. 5, 2014 in New York. (Photo by Evan Agostini/Invision/AP)

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Madonna participates in Amnesty International's "Bringing Human Rights Home" Concert at the Barclays Center on Wednesday, Feb. 5, 2014 in New York. (Photo by Evan Agostini/Invision/AP)

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Madonna, left, introduces Maria "Masha" Alekhina of Pussy Riot to the stage Amnesty International's "Bringing Human Rights Home" concert at the Barclays Center on Wednesday, Feb. 5, 2014 in New York. (Photo by Evan Agostini/Invision/AP)

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Madonna participates in Amnesty International's "Bringing Human Rights Home" Concert at the Barclays Center on Wednesday, Feb. 5, 2014 in New York. (Photo by Evan Agostini/Invision/AP)

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This photo provided by The Monuments Men Foundation for the Preservation of Art of Dallas, shows Monuments Man George Stout, second from right, with others as they remove Michelangelo’s Bruges Madonna from the salt mine in Altaussee, Austria, July 10, 1945. Priceless works of art from the salt mine posed problems for Stout unlike any ever contemplated. Stout constructed a pulley to lift Bruges Madonna onto the salt cart to begin its long trip home to Belgium. From a fairy tale-inspiring castle in the Bavarian Alps to a serene sculpture of Mary and Jesus by Michelangelo tucked away in a church in Belgium, sites and works of art across Europe can give travelers a glimpse at the heroic work done by those who worked to save cultural treasures during World War II. (AP Photo/National Archives and Records Administration)

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Miley Cyrus performs with Madonna for MTV Tuesday Jan. 28, 2014. The 21-year-old pop star and the 55-year-old Queen of Pop grinded and grabbed each other as they performed Cyrus' hit "We Can't Stop" and Madonna's 2000 track "Don't Tell Me" Tuesday during a taping in Hollywood. The "MTV Unplugged" special that closes with the duet is set to air Wednesday. (AP Photo/Sandy M. Cohen)

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Queen Latifah introduces a performance of "Same Love" by Macklemore Ryan Lewis, with Mary Lambert, Trombone Shorty and Madonna at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Performers, from left, Macklemore, Mary Lambert, Madonna, Ryan Lewis and Queen Latifah appear on stage during a performance of "Same Love" at the 56th annual Grammy Awards at Staples Center on Sunday, Jan. 26, 2014, in Los Angeles. (Photo by Matt Sayles/Invision/AP)