Oprah has confirmed that Rihanna will be on her show. The two will sit down for a likely tell all, in depth interview. Oprah reveals the news on Twitter yesterday. A fan tweeted to Oprah to get Rihanna on the show next, do it. To that Oprah replied, she's coming soon. And when coaxed by a couple other fans, Ms. Winfrey reveals simply yep, in August.