The convoy's big trip started yesterday as the Wallabies kicked off their Rugby World Cup tournament with a win over Italy.
Kerr said she was excited to see so many Wallaby supporters.
"It's awesome to see such passionate fans supporting the Qantas Wallabies.
"The six-week Great Crusade convoy is the perfect way for fans to get behind the team and see New Zealand at the same time."
Kerr is married to British actor Orlando Bloom, of The Lord of the Rings, Pirates of the Caribbean and Troy fame. The couple have a son, Flynn.
Last month they were spotted house-hunting looking at a four-bedroom rental property.
The location of the home could not be confirmed, however a source told the Herald at the time that Kerr had been seen in a shop in Wellington.
Bloom is set to star in the two forthcoming Hobbit films to be produced in New Zealand.