This isn't the first time Clarkson will perform the song, having performed it at a show last year in Charlotte, North Carolina, after a fan requested it. "This is my favorite part of the show because it's the one song we do different every night," she said. "With YouTube, no show is really that sacred because everything is online right after the first show. So, we like to make every show special. We let somebody in the audience we're at every night pick a song and we learn it that day."