Carol Channing is one-quarter African-American.

From her Wikipedia entry:

According to Channing's memoirs, when she left home to attend Bennington College in Vermont, her mother informed her that her father, a journalist who Carol had believed was born in Rhode Island, had in fact been born in Augusta, Georgia, to a German American father and an African American mother. According to Channing's account, her mother reportedly didn't want [Channing] to be surprised "if she had a black baby". Channing kept this a secret to avoid any problems on Broadway and in Hollywood, ultimately revealing it only in her autobiography, Just Lucky I Guess, published in 2002 when she was 81 years old.

She was also born in Seattle. But I bet you already knew that.