"Wrong shoes," Oprah Winfrey joked after tumbling to the floor during a speaking engagement in Los Angeles on Saturday. Before the fall at the "Oprah's 2020 Vision: Your Life in Focus" event, the star had been talking about leading a balanced life, People reports. She was steadied by boyfriend Stedman Graham, who rushed up from the audience, and finished the opening talk barefoot. "I thought this was a great day in spite of the fall," the 66-year-old later said on Instagram. “But I picked myself up. I don’t know if it was something on the floor, or my foot twisted, or what." Jennifer Lopez was Oprah's special guest at the LA show, which was the second-to-last event on the tour, Fox reports. It wraps up in Denver next week. (More Oprah Winfrey stories.)