The couple, who married eight years ago, are already parents to Denni Montana, 13, and Zoe Giordano, 9, and insist they're delighted to welcome another girl into the family.
In a joint statement they say, "In this crazy patriarchal world we live in, we are doing our part to balance the energy.
"We are proud to announce the completion of our goddess trilogy with the birth of our third daughter, Makani Ravello, born on June 3rd."
The family lives on the Hawaiian island of Maui.
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