The actress is currently filming an upcoming TV movie called Younger and has had to swap her warm and sunny home in LA this week for the freezing temperatures of the East Coast.
But she's still looking good in her on-trend outerwear!
Hilary teamed her shiny red puffa with a black scarf and black skinnies, as well as sporting a pair of sturdy and studded black boots, similar to a pair of boots that Kourtney Kardashian was spotted wearing recently.
Joining the 26-year-old on her trip to the Big Apple was son Luca, who also donned his very own puffa coat, this time in a bright green colour.
While the twosome hung out away from the film set, Luca decided to give his mum a makeover and took a stab at being her make-up artist for the day.
Hilary posted an adorable montage of photos on Twitter, which show her tiny tot - who will be two years old next month - attempting to apply some lipgloss on her lips.
But his aim wasn't exactly spot on!
As well as getting back to her acting work, Hilary has been busy recording some new music too and had a quick studio session this week in New York.
The star has been putting on a brave face as of late, since announcing that she and husband Mike Comrie are splitting.
In January, Hilary and Mike announced that they've decided to go their separate ways after three years of marriage.
However, the couple have insisted that the break-up is amicable and Hilary tweeted: "Mike and I are sitting here, we are so appreciative for all of your kindness & well wishes. Not an easy day but we're getting thru it together (sic)."
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