Rihanna sat down with Oprah for an upcoming "Next Chapter" episode and she opened up about the Chris Brown break up.

Rihanna said very clearly that, "It was embarrassing. It was humiliating. I lost my best friend."

Rihanna also admitted to feeling resentful, dark and holding a grudge.

Besides her relationship with Chris, Rihanna opened up on how she deals with fame and her love for her hometown of Barbados.

Rihanna's episode of "Oprah's Next Chapter" airs August 19th.