Three people have appeared in court over their alleged role in a high-end prostitution ring linked to the Cannes Film Festival and one of Colonel Muammar Gaddafi's sons.
Another five people, who are on the run, are being tried in absentia by the court in Marseilles.
They include Elie Nahas from Lebanon who claimed to run a modelling agency employing young women recruited in South America, France and Eastern Europe.
The three who turned up in court included Sabrina Samari, an alleged escort girl from Cannes, who has admitted to procuring women.
The others were Venezuelan Felix Farias, who worked for a branch of Nahas' modelling agency, and Lebanese driver Antoine El Khoury.
Nahas is accused of organising a birthday bash for Mutassim Gaddafi, the fourth son of the late Libyan dictator. The party, which was held in 2004, allegedly cost £935,000 (\$1.5m), with several stars and about 20 models in attendance.
Nahas also caused a scandal in 2007 when he turned up at Charles de Gaulle Airport in Paris with eight young women, one of whom was a minor, to attend the Cannes Film Festival. They were refused entry.
Wiretapped telephone conversations from the time showed the involvement of four Lebanese nationals, a Venezuelan and two escort girls from Cannes in an alleged prostitution ring.
An inquiry established that young women of various nationalities, including models, beauty queens and escort girls, had been recruited, especially during the Cannes Film Festival.
Clients from the Middle East, Saudi Arabia and Kuwait were apparently ready to pay thousands of pounds for their services.
Patrick Rizzo, a lawyer for an anti-procuring charity that is a civil party to the trial, claimed the legal investigation had been hampered by Col Gaddafi's links to the French government.
He said: "Colonel Gaddafi was received at the Elysee (French presidential palace) at the time - he was France's good friend.
"All this context did not favour international investigations."
Mutassim Gaddafi, 36, was captured and killed along with his father on October 20 following the fall of the city of Sirte last year.