One Nation leader Pauline Hanson has refused to say who paid for her trip to Italy, after returning to London to speak at a pricey political dinner.Senator Hanson has been in the United Kingdom and Europe for almost two weeks.She has described the trip as "a fact-finding mission" and met with multiple right-wing figures.But the 72-year-old has also been spotted in the Sicilian tourist town of Taormina, where she attended a Dolce & Gabbana fashion show and appeared on the pool deck at a swanky hotel alongside her billionaire friend and political benefactor Gina Rinehart.On Friday afternoon, local time, the pair emerged at the Conservative Political Action Conference (CPAC), held at the InterContinental Hotel in London's south-east.When asked by the ABC if she had paid for her time in Sicily, Senator Hanson raised her hand and said: "I need to go inside."The Mediterranean sojourn has drawn jibes from Senator Hanson's opponents in Canberra, including Opposition Leader Angus Taylor, who has accused her of "being over in Italy, living it up", while others have questioned who has footed the bill.A spokesperson for the One Nation leader has said all tax-payer-funded travel will be disclosed publicly, in accordance with parliamentary rules.In a video posted to social media on Friday, Senator Hanson said her trip had not cost tax-payers "one dollar"."Yes I went to Sicily What an experience, I was invited," she said."I've never been to anything like that, and I thought, 'Yes I'm going to go and see it.'"Senator Hanson was scheduled to deliver a speech as part of a black-tie dinner at CPAC on Friday night, local time