Derek Hough has officially brought his moves back to !The 35-year-old dancer, who is serving as a judge for season 29 of the dance competition show, performed with his girlfriend, Hayley Erbert, on Monday. The two showed the contestants how it's done, dancing a sexy Paso Doble to «Uccen» by Taalbi Brothers.ABC announced last week that Hough would be performing during the Oct.