Naomi Watts insists it is "important" to support Liev Schreiber.
The 'Shut In' actress split from her long-term partner - the father of her sons Sasha, nine, and Samuel, seven - in September but she was spotted in the audience at the actor's new Broadway play, 'Les Liaisons Dangereuses' last week as she thinks it is vital for their children that things stay cordial between them.
She said: "He's the father of my kids. So it was important to support him."
But Naomi admitted she was also keen to see the play because the 49-year-old actor is such an "extraordinary talent".
She added to 'Entertainment Tonight': "I was very curious to see this and all of his work.
"The play is fantastic and really I hope everyone gets to see it because he does some extraordinary work up there."
Naomi can next be seen in 'Shut It', where she plays grieving Mary, whose husband died and son was left paralysed following a freak accident.
And the 48-year-old actress drew on her own experiences of parenting to inspire her character.
She said: "I am a mother and I know what it is to be a mother. I know the challenges and the struggles and the guilt.
"[Your kids] take up all your focus and you just want to do the best by them. And that's what Mary's trying to do as well."
The couple's split came after an 11-year-long relationship, stating they felt the "best way forward" for the two of them - and for their family - was to "separate as a couple".
A joint statement released at the time read: "Over the past few months we've come to the conclusion that the best way forward for us as a family is to separate as a couple. It is with great love, respect and friendship in our hearts that we look forward to raising our children together and exploring this new phase of our relationship. While we appreciate your curiosity and support, we ask the press to be mindful of our children and respect their right to privacy."
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