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The couple's newest addition is a baby girl named Grace Isabelle McCaw.
In a Facebook post announcing her arrival, Richie said: "Mum and baby are doing well and Charlotte is excited to have a new sister."
Grace was born on May 30. The couple already have daughter Charlotte, who turned 2 in December last year.
The couple announced they were expecting the second child in January.
The McCaws got married in Wanaka in January 2017.