Oprah Winfrey interviewed Tim McGraw recently for one of her upcoming episodes of Oprah's Master Class. And according to reports, they two will sit down for a very emotional conversation.

Those reports go on to say that McGraw will reveal the family secret that would change his life forever. (The whole idea behind the series is to tell the stories you've never heard from the people you thought you knew best.)

But knowing McGraw has that big of a secret is killing me. Is it killing you? I mean, we all already know about the huge secret he discovered at age 11 when he first learned his biological father was the Philadelphia Phillies pitcher Tug McGraw. McGraw told Larry King in a 2002 interview that he discovered that big shocker when he was going through his mom's bedroom closet looking for Christmas presents when he found his birth certificate.

So if that's not the family secret that changed his life what is? Could it be something else about his Louisiana roots? Something else about the father who raised him, Horace Smith? Or something else entirely?

Other singers Winfrey has featured on the tell-all show include Jay-Z, Reba McEntire, Jon Bon Jovi, Alicia Keys, Stevie Nicks and Lenny Kravitz. Besides McGraw, this season's lineup includes singers Justin Timberlake and Lionel Richie.

McGraw's episode is scheduled to air on the Oprah Winfrey Network (OWN) in June.