ET spoke with JoJo Siwa and her dance partner, Jenna Johnson, about the 18-year-old singers TikTok mishap that happened right before the Dancing With the Stars live taping. During Disney villains night, the pop star showed off her dark side while dancing to Ways to Be Wicked from Descendants 2. JoJo and Jenna also open up to ET about what it was like to embrace their inner-villain. Dancing With the Stars airs Mondays on ABC.Exclusives from EntertainmentTonight :