FILE - In this Jan. 11, 2006 file photo released by CBS, Madonna joins host David Letterman on the set of "The Late Show with David Letterman," in New York. Madonna was in town to attend a special screening of "Arthur and The Invisibles." Letterman announced his retirement during a taping on Thursday, April 3, 2014. Although no specific date was announced he told the audience that he will leave his desk sometime in 2015. (AP Photo/CBS, J P Filo, File) MANDATORY CREDIT; NO SALES; NO ARCHIVE; NORTH AMERICAN USE ONLY
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