John Legend, Dr. Rae Wynn-Grant, Wilmer Valderrama, Jim Nantz

John Legend, singer-songwriter and pianist and Dr. Rae Wynn-Grant, host of "Wild Kingdom" and author of Wild Life: Finding My Purpose in an Untamed World.Actor Wilmer Valderrama joins to celebrate the 1000th episode of NCIS.Jim Nantz, CBS sports commentator.