Gilles Marini and last season&#39;s champ Peta Murgatroyd appear in an official cast photo for &#39;Dancing With The Stars: All-Stars&#39; season 15. The new season of &#39;Dancing with the Stars,&#39; premieres on Monday, September 24 at 8 p.m. on ABC. <span class=meta>(ABC &#47; Craig Sjodin)</span>
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