The star was pictured at JFK Airport on Wednesday (25 June) with four-year-old Mason and one-year Penelope in tow.
And aww, look at little Mason's superhero hoodie!
Kourtney Kardashian has returned to New York with children Mason and Penelope to resume work on her Hamptons reality show.
Kourtney and boyfriend Scott Disick and their kids are currently based in New York while she films spinoff show Kourtney & Khloe Take The Hamptons!, which follows her and sister Khloe as they launch a pop-up boutique in the posh Hamptons area.
They'll also be working in their Dash New York boutique.
Perhaps it's appropriate then that Kourtney spent quite a while answering fans' fashion questions via Twitter last night, promoting the latest Kardashian Kids collection.
When asked if the line had been hard work, she replied: "It's definitely challenging but a lot of fun. Work is never hard when you love what u do."
As for the number one priority with the collection, she said: "All about comfort and whether the pieces are practical for mums and their daughters."
Currently, the collection is just for girls but a boys' range is planned for next year.
Kourtney and the kids had spent the weekend back home in LA helping Kim Kardashian's daughter North celebrate her first birthday at a music festival-themed party.
Scott had stayed in New York to attend a nightclub promotional evening belatedly marking his birthday.
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Is Mason the most stylish celebrity kid around?