Robert Irwin, his mom, Terri, and his pro partner, Witney Carson, chat with ET's Denny Directo at rehearsals for Dedication Night on 'Dancing With the Stars.' Robert is dedicating his week five dance to his family, which includes his late father, Steve, and his sister, Bindi, who won the season 21 of 'DWTS.' = Robert invited Terri to be part of his special performance, even after some trash talk with ET earlier this year. Terri also reveals why she's 'impressed' by her son's sexy dance moves, which have shocked fans throughout his time on the show so far. 'Dancing With the Stars' airs live on Tuesdays on ABC and streams on Hulu and Disney+.