Hilary Duff by Theo Wargo/WireImage.com Hilary Duff by Theo Wargo/WireImage.com
Adam Shankman, the director and choreographer of the upcoming Hairspray movie musical, will serve as a guest judge on this Wednesday's So You Think You Can Dance. In addition to offering his extremely qualified two cents, Shankman will choreograph a group routine set to "You Can't Stop the Beat" from Hairspray, to be performed during Thursday's results show. Also on Thursday, as the judges prepare to send two more dancers home, Hilary Duff will perform "Stranger" from her latest album, Dignity, named after the one thing she still has that most of her pop-tart peers do not. POLL: Which reality show's return are you most looking forward to? Choose from our list and vote here.