Italian Prime Minister Silvio Berlusconi will go on trial in April over allegations that he paid a 17-year-old girl for sex and abused his power by trying to get her cleared of theft, a judge ruled Tuesday. Granting a request by Milan magistrates, Judge Cristina Di Censo said the first hearing would take place on April 6, in a move that brings a long-running probe into the premier's private life to a head.