Céline Tran, born April 9, 1979 in Lyon, is a personal development coach, comic book scriptwriter and French blogger, former pornographic actress from 2001 to 2013 under the pseudonym of Katsumi (2001-2007) then Katsuni (2007-2013).

She was for more than ten years one of the stars of the X industry in which she made a career first in France and then in the United States. Also a producer and on occasion a director, she has won numerous specialized awards, including various AVN Awards (including three times that of the best foreign actress) and two Golden Hots.

In 2013, she retired from porn and returned to France. She then uses her real name in her various public activities, including actress, blogger, screenwriter and comic book editor, or sex coach.