The show has only been available on New Zealand TV screens since the Vibe channel picked it up and started screening it this month.
The family were having to download episodes and dad John Kelly said he was proud of the way the way his son had dealt with criticism he received from the judges in the early episodes where he "stumbled a bit".
Things really picked up for Sean when he won the challenge to design a dress for model Heidi Klum to wear to the Creative Arts Emmy awards in August and photos of Ms Klum in the distinctive blue and black fringed dress made waves around the world.
Heidi Klum wears Sean Kelly's design at Creative Arts Emmy awards in Los Angeles.
Sean has now been declared the Project Runway winner since his New York Fashion Week collection was judged best of the four remaining contestants on the show.
The lad who grew up on a South Taranaki farm and begged his mum Margaret, who didn't sew, for a sewing machine from the time he was 13 and made patterns from newspaper is now the toast of New York.