So You Think You Can Dance has a lot to celebrate — hitting 300 episodes welcoming new judge Leah Remini!Fox announced Friday that Remini, who competed on season 17 of and also served as a temporary co-host, would be replacing Matthew Morrison at the judges' table. She'll be joining Stephen «tWitch» Boss and JoJo Siwa for the 300th episode, set to air Wednesday.ET's Denny Directo spoke with Remini and the crew about reaching the impressive milestone and infusing new energy into season 17 of the dance competition show.