Oprah Winfrey (b. 1954) is the host of The Oprah Winfrey Show and, according to Forbes magazine, the richest African-American in the world.
Her book, "In the Kitchen with Rosie: Oprah's Favorite Recipes" was parodied by Miss Piggy with her own cookbook entitled "In the Kitchen with Miss Piggy". In Sesame Street season 41 in 2010, she voiced a cartoon letter O in a parody of her program. (YouTube)
She also voiced Eudora in Disney's 2009 film The Princess and the Frog.