Naomi Watts looks cheerful as she wraps up against the chilly New York winter alongside boyfriend Billy Crudup

By CANDICE JACKSON FOR DAILY MAIL AUSTRALIA 21:41 04 Nov 2019, updated 23:27 04 Nov 2019

Their romance flourished after starring as husband and wife in the Netflix series, Gypsy.

And actors Naomi Watts and Billy Crudup, both 51, looked in happy spirits while taking a stroll in New York City on Monday.

Naomi cut a low-key figure as she wrapped up against the chilly weather alongside her boyfriend, who is a four-time Tony Award nominee.

Keeping it casual: Naomi Watts (left) looked cheerful as she wrapped up against the chilly New York winter alongside boyfriend Billy Crudup (right) on Monday

Naomi looked effortlessly chic as she rugged up in a few layers, including a beanie which she wore over her short blonde locks.

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She clasped her hands together for warmth while wearing a grey jumper under a dark suit jacket.

Pounding the pavement at pace with Billy, she wore a comfortable pair of tracksuit trousers and black sneakers.

Windswept beauty: Naomi covered her blonde locks with a small black beanie and shielded her eyes with large pink sunglasses

Billy also wore tracksuit pants and sneakers, and kept his hands in his double-layered jacket pockets.

Wearing a New York Yankees baseball cap, Billy appeared in deep conversation with his girlfriend.

Elsewhere on the day, Naomi was seen out and about solo in gym attire and a pair of stylish slip-on shoes.

Walk and talk: Wearing a New York Yankees baseball cap, American actor Billy appeared in deep conversation with his Aussie girlfriend

In June 2017, the Netflix series, Gypsy, premiered on Netflix.

Naomi and Billy portrayed husband and wife team, Jean and Michael Holloway.

Their on-screen relationship soon turned to real-life love, and the duo were outed by Page Six as a couple one month later.

Running errands? Elsewhere in the day, Naomi was seen out and about solo in gym attire and a pair of stylish slip-on shoes

Prior to their relationship, Naomi was in a long-term romance for 11 years with fellow actor, Liev Schreiber, 50.

The couple, who announced their separation in 2016, share two sons together: Alexander 'Sasha' Pete, 12, and Samuel Kai, 10.

Billy was previously in an eight-year relationship with Mary-Louise Parker, with whom he shares a 14-year-old son, William.

Moving on: Prior to her new relationship, Naomi was in a long-term romance for 11 years with fellow actor, Liev Schreiber

Billy Crudup Netflix Naomi Watts