― 6 Oprah Winfrey may be slipping these days and growing a tad desperate for ratings, but the media mogul is still not afraid to ask tough questions.Rihanna may often cast herself as edgy and hard, but when relaxed and on her home turf (Barbados), she's not afraid to answer them, candidly.When asked about the end of her relationship with Chris Brown for Oprah's Next Chapter, Rihanna teared up. "It was embarrassing," she said."It was humiliating. I lost my best friend.""I was resentful. I held a [...].