United Kingdom, May 9 -- Liev Schreiber enjoyed "the most profound moment" with his transgender daughter Kai when she asked her family to change her pronouns.

The actor is father to 16-year-old model Kai with his ex Naomi Watts and he's revealed it didn't "feel like that big of a deal" to him when she asked for the change but it was a "profound" step.

He told Variety: "Kai was always who Kai is. But I suppose the most profound moment was her asking us to change her pronouns. To be honest with you, it didn't feel like that big of a deal to me only because Kai had been so feminine for so long."

Schreiber added of his daughter: "Kai is such a fighter. It's important that she goes, 'Hey, I am trans,' and, 'Look at me'."

Kai is due to join...