Catherine "Kate" de Castelbajac (born Katherine Lee Chambers in Santa Barbara, California) is a former model and fashion journalist who now works as an image consultant and educator. She is currently the founder of CdeC Academy of Santa Barbara, and is affiliated with the Association of Image Consultants International.
Kate Chambers was born in Santa Barbara, California, to William Joseph Chambers and Lillian Chambers, and graduated from Foothill High School in Santa Ana, California. While a senior at Barnard College, where she would earn a BA in English Literature, Chambers was discovered by the photographer Jean Pagliuso and the editors of Mademoiselle. She became the subject of an article in the September 1975 issue entitled "The Makings of a Model", in which she was transformed from student to model. Castelbajac continued her education at Simmons Graduate School of Management, in Boston, MA, where she would earn an MBA in 1996.
The Mademoiselle feature helped launch Chambers into a career in high fashion, as she began working with the Ford Modeling Agency and such photographers as Arthur Elgort and Patrick Demarchelier, appearing in magazines like Harper's Bazaar. Eileen Ford then sent her to Paris, where, in October 1976, she met fashion designer Jean-Charles de Castelbajac. The two were married in 1979 and she became the 14th Marquise de Castelbajac. They would have two sons together.
During the late 1970s and early 1980s she was among the most popular models in Europe, working for French Vogue, Elle, Cosmopolitan, and represented the line of cosmetics Orlane B23. She also appeared in several runway shows for Chloé, Karl Lagerfield, Chanel, and Issey Miyake.