Sturm said as his client was already in jail he said there was no need for a new pre sentence report or a restorative justice conference and sentencing should be expedited.
There was no resistance from the Crown, so Judge Simon Menzies convicted Brown on the new charge and remanded him in custody for sentencing later this month.
Brown is currently serving a prison term for historic offending against a 9-year-old altar boy, a 16-year-old whose dad had died and mother was dying of cancer, and a 6-year-old orphan.
Two of the boys were living in an Auckland orphanage, another was at home with family but attended the same church where Brown was a priest in Hamilton.
Brown had been living in Auckland after being released from prison in the 1990s after serving 15 months' jail for offences against young boys, before a second lot of charges were laid last year.
The latest victim was understood to have come forward to police after reading about Brown's offending in the Herald earlier this year.