Derek Hough is keeping fans updated on his wife Hayley Erbert’s ongoing health battle. Early Wednesday morning the “Dancing With The Stars” judge revealed the 29-year-old will undergo an extensive surgery later today. “I strongly believe all the prayers that have been sent with the intention and love of Hayley’s recovery has helped so much. I can’t thank you all enough. She is going in for surgery this morning to replace a large portion of her skull that was removed during her Craniectomy,” he explained.