The fashion designer, 67, is baffled by the British public's adoration of the "stupid" princess, and insists Camilla, who wed Charles in April last year (05), is both fun and intelligent.
He tells New York magazine, "She was pretty and she was sweet, but she was stupid.
"The public does not know who Camilla is. She is the life of the party! She's sparkling, she's witty, she's ready for everything, and not pretentious, not one bit. If you had to make a choice to live with somebody, this is the one."
Diana, Princess Of Wales was killed in a Paris car crash in August 1997.