06/16/1999 AT 12:00 AM EDT
Six people are currently on trial in Paris for allegedly running a high-priced prostitution ring for an international clientele of movie stars, politicians, arms dealers and millionaire businessmen. As part of the two-year inquiry which led up to the trial, Robert De Niro was picked up in Paris last February and interrogated by police for nine hours. (The star was reportedly so furious that he threatened never to return to France.) Investigators are reportedly interested in talking to Brigitte Nielsen, the actress and ex-wife of Sylvester Stallone. A Gulf state prince allegedly offered her nearly $750,000 pounds to spend one night with him.