A second 17-year-old girl has been named as taking part in what prosecutors allege were sex parties held by the Italian prime minister.
The girl, named as Iris Berardi, was known to police as a prostitute, Italian reports say, and attended one of the events days before turning 18.
The details have emerged from new documents submitted by prosecutors on Wednesday to a parliamentary committee.
Mr Berlusconi says the allegations against him are politically motivated.
Using the services of prostitutes is not a crime in Italy, but paying a prostitute aged under 18 is an offence.
Ms Berardi’s presence at Mr Berlusconi’s villas in Sardinia and Milan has been proven by mobile phone records, Italian media report.
