Oprah Winfrey made a rare appearance with her longtime partner, Stedman Graham, at a party for the anniversary of her iconic talk show. Over the weekend, the businesswoman celebrated the upcoming 40th anniversary of “The Oprah Winfrey Show” with her former co-workers at Navy Pier in Chicago. In a video shared on Winfrey’s social media, Graham made a brief appearance, posing with Chef Art Smith at the latter’s restaurant, Reunion. For the outing, Graham, who is the CEO of his own management and marketing consultancy firm, wore a black suit and white shirt. Meanwhile, Winfrey donned a matching cream pinstripe blazer and pants. “I cannot even…