On 'Prince Night,' Zac Efron finally popped up to support little brother Dylan Efron and see him make it to the finals on 'Dancing With the Stars,' airing Tuesdays on ABC and streaming on Hulu and Disney+. 'The Traitors' alum and his pro partner, Daniella Karagach, chat with ET's Denny Directo after the taping, beaming over the support from the crowd. Source