Robert Irwin took home the Mirrorball Trophy on season 34 of Dancing with the Stars , which he competed on with his partner, Witney Carson. Although he showed off his incredible dance moves during his run on the show, he recently revealed that he hurt himself dancing in private. "Nobody knows this,” the star said when he appeared on The Tonight Show Starring Jimmy Fallon on May 4. “But [the injury] wasn't actually on the show. This is after the season of Dancing with the Stars ended. I was alone in my room. I have a little fireplace. It's made out of stones. And I'm sitting there going, 'I wonder if I've still got it.'" He continued, "You know, the one that has all the kicks? I put the song on and I just start going full ham, 100% around my house. And I just slam my foot into the fireplace." Irwin went on to explain that the injury was actually a broken foot. "I'm rolling on the floor, ballooned, like this giant bruise,” he said. “And yeah, I broke my foot doing the jive in my living room, on my own.…