A U.S. judge has denied rapper M.I.A.'s request to keep her ongoing child custody dispute with her ex-fiance Benjamin Bronfman behind closed doors. The Paper Planes hitmaker has been embroiled in a nasty legal battle with the wealthy music mogul over their four-year-old son Ikhyd ever since they split in 2012. In March (13) the British singer, real name Mathangi Arulpragasam, was banned from taking the boy out of the U.S. after Bronfman successfully applied for a restraining order, and now she has been dealt another blow following New York federal court Judge Margo Brodie's rejection of her plea for a private trial. According to the New York Post, the 37 year old has also filed new legal documents in support of her bid to take the tot to her native England, citing the 1996 Hague Convention, an international treaty that focuses on child custody, as her main argument.