"How GD! Jst heard that @MirandaKerr n Orlando Bloom were at our game last night - Loving the support," he said.
Bloom is in New Zealand for the filming of Sir Peter Jackson's Hobbit movies. He has been a fan of New Zealand since starring in The Lord of the Rings trilogy.
Last month, Kerr and Bloom - whose first son, Flynn, was born in January - were spotted house-hunting in Wellington, looking at a four-bedroom rental property.
Bloom and Kerr usually divide their time between Los Angeles and London.
On Sunday morning, Kerr made an appearance at the launch of the Great Crusade campervan caravan for Wallabies fans, where she joined Australian rugby legend John Eales in cooking breakfast for supporters.