Hunter Biden will have to face baby mama Lunden Roberts in court

Hunter Biden will have to face his baby mama in court if he wants to slash paternity support for his four-year-old lovechild, DailyMail.com can reveal.

The First Son, 53, petitioned an Arkansas judge last year to recalculate the money he pays each month to Lunden Roberts, the mother of Navy Joan Roberts, the little girl he barely acknowledges is his.

But Hunter's feisty former flame refused to re-negotiate and instead the pair will settle their differences in open court when the case goes to a two-day bench trial in July.

If the recovering drug addict wants to win, he has until May 22 to produce detailed financial records to demonstrate why he's suffered a 'substantial' loss of earnings – all of which will enter the public record.

The President's son will also have to submit to a deposition in June in which lawyers for Roberts, 32, will have the chance to grill him over his various businesses and shady overseas ventures.