https://www.snopes.com/fact-check/was-robert-deniro-child-trafficking-ring/
This?
Kind of surprised it was reported in the British press,in 1998,given the UK's libel laws (maybe I shouldn't be given that British arms manufacturers are competing with the French for contracts in the Middle East):
"Six people are charged with the running of an international prostitution ring, whose call-girls entertained the actor Robert de Niro, the former tennis player, Wojtek Fibak,
two senior (but unnamed) French politicians and several Gulf princes. The agency specialised in tricking, or trapping, star-struck teenage girls into selling their bodies with the promise of careers as models or actresses.
........
The files of clients' names seized by the police are said to include many well-known members of the sports and show-business jet-set on both sides of the Atlantic. The only names to emerge so far are De Niro, Fibak and the French film producer, Alain Sarde.
De Niro, despite a much publicised "arrest" in Paris while filming a movie earlier this year,
was questioned only as a witness and occasional client of the network's prostitutes. He is suing the investigating magistrate, Frederic N'Guyen Duc Quang, following his highly publicised interrogation; the actor's lawyers accuse the investigator of deliberate publicity-seeking."
https://www.independent.co.uk/news/the-sex-scandal-that-wouldnt-lie-down-1185127.htmlSeems,unlike certain leading leading French politicians and Gulf princes, Bob was only an "occasional" user of underage prostitutes.
So,nothing to see here.