Danielle Turchiano Senior Features Editor, TV“Dancing With The Stars” has gone through quite a few changes this season, and it’s about to go through another: Derek Hough will step out from behind the judges’ table to take the dance floor once again, on Oct. 19.The six-time Mirrorball champion will perform a routine with his girlfriend and “Dancing” alum Hayley Erbert, his first in-show dance since 2017.