The mother-of-four looked fresh faced with a curly, auburn hairstyle that fell down to her bust.
Nicole, 51, was dressed casually for her day of filming in deep purple dress and bohemian patterned scarf.
The Big Little Lies star bundled up against the bitter NYC cold in a black, knee length puffer jacket.
According to Daily Mail, Nicole is currently working on the upcoming HBO series The Undoing.
A natural red-head, it's been many years since Nicole wore her tresses without heated styling or dye.
The actress bore a striking resemblance to her former self as she let her strawberry blonde locks loose around her shoulders.
Nicole's return to her original locks comes in the wake of a report from the US National Enquirer which claims the star is "obsessed with plastic surgery".
According to the publication, Keith Urban's wife is trying "every wacky trick in the book" in a bid to stay forever young.
The report goes further to sensationally suggest the Moulin Rouge actress has spent over $1m on “years of botox and filler injections,” and a string of surgeries that have left her “preserved”.