Katherine Jenkins, who competed on the show last season and finished in second place, returned to the ballroom as a musical guest on &#39;Dancing With The Stars: The Results Show&#39; on Tuesday, Oct. 2, 2012. She sang with Placido Domingo. The two sang &#39;Come What May.&#39; Their duet was accompanied by pro dancers Valentin Chmerkovskiy and Anna Trebunskaya. <span class=meta>(ABC Photo)</span>
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