Mr Brown said the Fifa tournament was "huge for the nation" and wished the players luck.
"Give it heaps," he said.
Mr Brown then led his own waiata, backed up by those on stage.
MC Stephen McIvor, who had been building excitement in the crowd since 4.30pm, then interviewed Junior All Whites captain Bill Tuiloma and coach Darren Bazeley.
The New Zealand players ended the formal part of the welcome by lining up to hongi members of Ngati Whatua.
Riley Hancock was at the event with his brother and parents and said he was very excited for the upcoming World Cup games.
The 7-year-old was a member of Eastern Suburbs Football Club and said he was looking forward to seeing players from all around the world, "because they will be rising stars".
He and his family would be going to every game at North Harbour Stadium.
The Junior All Whites then took part in a signing session, with youngsters of all ages lining up to get their autographs.
Meanwhile, musician Josh Leys entertained those still gathered around the stage.
A "keepy-uppy" tournament took place earlier in the afternoon while people waited for the players to arrive, with a lucky few catching World Cup footballs as they were kicked out into the crowd.