For the first time in years, Maddie and Mackenzie are competing with solos against each other in the same age category. The pressure is even higher for Maddie--who, in addition to practicing her risky tap solo, has a new video with Sia premiering this week. Abby brings in celebrity guest choreographer Travis Payne to teach the girls a routine inspired by voguing, a style with which they are unfamiliar. They have to not only impress Abby, but also this high-profile choreographer who is a power player in the dance industry.