The 50-year-old best selling writer, whose great- grandfather was French, was given the honorary title by President Nicolas Sarkozy at a ceremony in Paris, reported Digital Spy.
The title was created by Napoleon Bonaparte in the early 19th century and constitutes the country's elite national merit society.
Foreigners cannot be officially inducted, but are routinely made honorary recipients. Other foreign celebrity knights include Jerry Lewis, Steven Spielberg and Barbara Streisand.