The FBI issued a warning that the Internet Crime Complaint Center has been collecting complaints about some very bad person(s) sending out emails telling them that they have been nominated for the "Oprah Millionaire Contest Show." They're asked for some limited personal information. That's just the hook.
The only potential millionaires in this one are the identity thieves phishing for your personal information. Try to avoid giving it to them or "Oprah."
If you do get the above-described email, let the FBI know on the IC3's complaint page.
Actually, this isn't the first time someone tried to parlay Oprah's goodness into ill-gotten gains. She was cited as endorsing a pyramid scheme a year or so ago. And in 2006 a very similar Oprah-based phishing attack was launched.