Catherine "Kitty" Kelley (born April 4, 1942) is an American journalist and author of several best-selling unauthorized biographies of Jacqueline Kennedy Onassis, Rock Hudson, Elizabeth Taylor, Frank Sinatra, Nancy Reagan, the British Royal Family, the Bush family, and Oprah Winfrey.
For the Sinatra biography, Kelley was praised for the quality of her research and for daring to risk a lawsuit, but her other works were not rated so highly by critics.
She has been described as a "professional sensationalist" and the "consummate gossip monger".