Oprah announces "family secret," from Jan. 24, 2011 episode of "The Oprah Winfrey Show"

*After promising to reveal a big family secret on-air, talk-show host Oprah Winfrey has confessed that she recently learned she has a half-sister she never knew about.

According to Fox News, Winfrey announced on today’s broadcast of “The Oprah Winfrey Show” that a Milwaukee woman named Patricia discovered that the two were half-sisters.

The woman says she had been searching for years for the identity of the mother who gave her up for adoption in 1963. She says she learned in 2007 that Winfrey was her half-sister. On her program, Winfrey says she learned about Patricia last November.

Winfrey says she was 9 years old and living with her father when her mother had the daughter and gave her up for adoption. She says she never even knew her mother was pregnant.

Winfrey says the two met on Thanksgiving day.

The talk show queen, who launched OWN, her own cable network on January 1, has a complicated family history. Born out of wedlock to teenage parents in Mississippi, the billionaire media mogul was variously raised by her grandmother, parents and a stepmother in Mississippi, Wisconsin and Tennessee.

For years, Winfrey believed that she was her parents’ only living child.