The Block winners Alex and Corban Walls add to their family with a baby boy

Alex and Corban Walls in their Block season 3 house. Photo / Michael Craig

The winners of The Block NZ 2014 have welcomed their baby boy into the world.

Alex and Corban Walls shared a photo of their son, Austen James, on Instagram on Friday.

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Warning: Baby Announcement! We have been a little quiet on our Instagram of late, but for good reason. Our baby boy Austen James Walls came into our world last Monday! He is so precious and we are so in love... And soooooo tired! #alexandcorban #haventsleptindays

A post shared by A&C Homestore (@achomestore) on Sep 28, 2016 at 9:30pm PDT

"Warning: Baby Announcement!" they wrote. "We have been a little quiet on our Instagram of late, but for good reason. Our baby boy Austen James Walls came into our world last Monday! He is so precious and we are so in love... And soooooo tired!"

But the pair are used to powering through tiredness. They worked on little sleep and tight time restrictions to win season three of The Block and took out the top prize.

They sold their Point Chevalier home for $1,552,000, giving them $307,000 in profit and prize money.

They were also the couple which won over fans when they gifted $30,000 of their winnings to fellow contestants Ben and Quinn Alexandre, who made just $10,000 profit on their home.

Since then, they've opened their own homeware shop, and of course, gone on to expand their family.

Sharing the news of their son's arrival on social media is nothing new for the Block stars, who announced and documented the pregnancy with a series of adorable photos and videos.

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Who wore it better? We are 36 weeks... And had a lovely wee baby shower today which we definitely felt showered with love by- thanks friends!!! #babywalls #alexandcorban

A post shared by A&C Homestore (@achomestore) on Aug 26, 2016 at 11:41pm PDT

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Newsflash | This is our life... Little wee Walls is due 24th September Whoop Whoop!!! #babywalls #featurewalls

A post shared by A&C Homestore (@achomestore) on Mar 16, 2016 at 2:45pm PDT

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Me and the boys spent the morning chillaxen like this. Sorry about it... But we deserve it. #dontbejealous #abouttoberippedopen #whananaki

A post shared by A&C Homestore (@achomestore) on Sep 5, 2016 at 4:44pm PDT