The Australian actress, currently shooting a biopic on Princess Diana, joined her husband Liev Schreiber and their two sons for a kick-about and some hula-hooping fun in New York.
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Kent-born Naomi, who married in 2005, looked happy and relaxed as she played with six-year-old Alexander Pete and Samuel Kai, five.
With his mop of blonde hair and stripey jumper, Samuel excitedly ran around with his brother before stopping for a cuddle with mum.
The hands-on parent is also currently promoting her new film The Impossible, in which she plays a survivor of the 2004 tsunami.
At the film's Madrid premiere, Naomi was joined by the story's real-life protagonist, an emotional meeting that prompted her to say "I'm going to cry."
Naomi was also recently pictured supporting her husband at the Venice Film Festival, where Liev premiered his new film The Reluctant Fundamentalist.
All the news as Duchess Kate's due date draws close...