Nicole Richie gets wet and wild for her upcoming guest spot on NBC's Chuck. The show's creator, Josh Schwartz, reveals that her character gets into a catfight with her teenage nemesis Sarah (Yvonne Strahovski) at a 10-year class reunion. "They get into a serious wet showdown in the old high school shower," he says. Nicole has all the right moves, according to her catfight costar. "She was really on it," Yvonne tells In Touch. "She didn't miss a beat."