Silvio Berlusconi girl 'Ruby' to testify at his trial 14 January 2013 Last updated at 10:42 The Moroccan nightclub dancer alleged to have been paid for sex by former Italian PM Silvio Berlusconi has arrived to testify at his trial. Prosecutors say Karima El Mahroug acted as a prostitute when under age. She and Mr Berlusconi deny having had sex. Ms Mahroug - better known by her nickname, "Ruby Heartstealer," had previously failed to appear in court. Mr Berlusconi's lawyers asked for the trial to be halted during Italy's current election campaign. Mr Berlusconi is standing in the election, after stepping down from a third term as prime minister in November 2011, when he was replaced by the technocrat Mario Monti. Lawyer Niccolo Ghedini said Mr Berlusconi would be too busy campaigning to follow the case or attend court - and also feared the trial could influence the election. Judges retired to consider the application. Prosecutors have accused the defence of trying to prolong, and now delay, the trial to avoid a verdict before the election, at the end of February. Ms Mahroug has been called twice before, but has failed to show up, apparently because she was on holiday in Mexico. Mr Berlusconi, now 76, is accused of paying to have sex with Ms Mahroug in 2010 when she was 17. Sex with a prostitute who is under 18 years of age is a crime in Italy. Abuse of power The billionaire media mogul has admitted sending Ms Mahroug money - but insists he was just making gifts to a friend in need. Prosecutors say they had sex on 13 occasions. He denies having had sex with her, and testified that, in any case, she had told him she was 24. Ms Mahroug also denies having sex with him - or being a prostitute. Mr Berlusconi is also accused of abuse of power, for intervening after Ms Mahroug was briefly held by police over theft claims. He allegedly urged police officers to release her, telling them, falsely, that she was a granddaughter of former Egyptian President Hosni Mubarak. He admits making the phone call, but denies putting police under pressure - and testified that Ms Mahroug had told him she was related to Mubarak. Mr Berlusconi faces up to 15 years in jail if found guilty.