Norway’s scandal-plagued Crown Princess Mette-Marit — whose flirty missives to perv Jeffrey Epstein were released last week — is caught in yet another family scandal after her son was arrested just a day before his high-profile rape trial. Marius Borg Høiby, 29, was taken into custody on Sunday night and is accused of assault, making threats with a knife, and violating a restraining order, according to Norwegian police. The Oslo district court ruled Monday that Høiby would be kept in kail for