Five-time "Dancing With the Stars" winner Derek Hough will not appear on the show's 20th season in March, in order to play the male lead in the "New York Spring Spectacular" at Radio City Music Hall beginning in previews March 12. Hough, 29, told People magazine yesterday that performing "in a show that celebrates everything that is beloved about New York City is a dream. I can't wait to show fans this production . . . it's going to be like nothing they've seen me in before." He co-stars with Laura Benanti ("Nashville") in the stage production, running through May 3.