Comprising Spanish, English and Spanglish re-recordings of songs from her second studio album B'Day, it featured as a bonus disc for the United States deluxe edition of B'Day, before being released separately on August 28, 2007 by Columbia Records.
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Irreemplazable opens with "Amor Gitano", a duet with Alejandro Fernández originally from Fernández' fifteenth studio album, Viento a Favor.