Siblings Julianne Hough and Derek Hough have been with Dancing With the Stars since Season 4 and Season 5, respectively. After winning a whole slew of coveted Mirrorball trophies (he has six; she has two), the Houghs redefined their roles on the long-running ABC reality series, which was recently renewed for a 34th season. Derek Hough became a judge on the show in Season 29. Julianne Hough also logged time at the judges’ table, starting in Season 19. She became DWTS‘s co-host in Season 32. However, both haven’t forgotten their ballroom roots. Last season, Derek performed a dance with longtime pal Mark Ballas (a three-time Mirrorball champion), and Julianne performed a surprise routine with Valentin Chmerkovskiy. “It was amazing,” Julianne tells TV Insider about her mid-show surprise move from the skybox, where she conducts post-dance interviews, and hitting the dance floor once again. “I came from being on the show as dancer to a judge to a host,...