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Actor Wilmer Valderrama stops by to celebrate the 1,000th episode of \u201cNCIS,\u201d which airs Monday night on CBS, and to tell Stephen about the work that goes into keeping the series fresh after 21 seasons. His memoir, \u201cAn American Story: Everyone\u2019s Invited,\u201d is due out in September.\nLearn more about your ad choices. Visit megaphone.fm/adchoices