According to 
Evenimentul zilei, a mysterious Romanian woman reveals her sexual fantasies in an erotic diary signed
 Belle de Nuit. Yes, 
Belle de Jour lives in London, the night corespondent here, in Romania.
The publishing house, 
Editura Trei, is the same that brought in Romania 
The Intimate Adventures of a London Call Girl, so the recipe is easy to follow:
In October 2006, the editors got some excerpts of a diary called 
Intimate Adventures of a Bucharest Call Girl , from an author that preferred to remain anonymous.
Lily Flower, as she called herself, the author says 
Belle de Jour inspired her. Her identity is still a mystery for the editors, who negotiated the contract with a lawyer.  In fact, the editors were the ones that proposed the 
Belle de nuit nickname, predictable , huh?
The speculations around 
Belle de Nuit began, then: porno stars, journalists, female writers and even male ones, who is behind 
Belle de Nuit? Dan Sociu, who signs the introduction says the book is well written and the fact a lawyer was sent to discuss the publishing conditions proves he/she is not far from this world.
But, of course, the editing house could know very well who 
Belle de Nuit is, after all this is a game involving money, isn't it?
Belle de Nuit- Exile, for you
Another thing: Belle de Nuit is not blogging, as 
Belle de Jour is.
full article here, in [Ro]picture found here