Dancing With the Stars pro Witney Carson and partner Robert Irwin are becoming as close as siblings as they take on the ballroom together. "We are just having the best time. I feel like we've become like this brother and sister duo," Irwin, 21, exclusively told Us Weekly after the Tuesday, October 7, episode. Carson, 31, agreed with Irwin's sentiment. "100 percent," she said. "I feel very protective over him, especially when the DMs get a little crazy. I get a little protective.