Baby joy! Billionaire Merivale owner Justin Hemmes, 52, welcomes his first child with model partner Madeline Holtznagel, 28

Justin Hemmes has welcomed his first child with his long-time partner Madeline Holtznagel.

The model, 28, announced their son’s arrival on Instagram on Sunday alongside a gallery of sweet photos.

‘Jaeger Justin Hemmes ❤️ 1.06.25,’ she captioned the post.

This is the model’s first child with the billionaire Merivale owner, 52. He shares two daughters – Alexa, nine, and Saachi, seven – with his ex-partner Kate Fowler.

The sweet photo dump included an array of snaps showing the couple’s newborn baby wrapped up in a blanket.

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Justin Hemmes (centre) has welcomed his first child with his long-time partner Madeline Holtznagel

The model, 28, (pictured) announced their son’s arrival on Instagram on Sunday alongside a gallery of sweet photos

‘Jaeger Justin Hemmes ❤️ 1.06.25,’ she captioned the post

One picture showed the new mum proudly holding her first child as she donned a matching pink pyjama set.

She was positively glowing as she beamed at the camera while her precious newborn wore a smile on his face.

Another picture showed Justine and Madeline looking windswept and content as they enjoyed a beach walk with their little one.

One adorable snap showed Justin leaning down to kiss baby Jaeger, who was tucked into his jumper to keep warm during the windy outing.

Friends and family flooded the comments section with well wishes for the couple and their new bundle of joy.

‘I love him,’ Madeline’s sister Simone Holtznagel simply wrote.

‘Congratulations. He’s beautiful,’ The Bachelor’s Anna Heinrich penned.

‘Yay!! I was thinking of you. I hope you’re healing well and enjoying the cuddles. Good job mumma! Congratulations,’ model Shannon Lawson chimed in.

Another picture showed Justine and Madeline looking windswept and content as they enjoyed a beach walk with their little one

Dina Broadhurst wrote: ‘OMG’ along with many red hearts.

‘Congratulations beautiful mama,’ Aussie influencer Jayde Heiser shared.

Madeline recently announced the sex of their baby in an interview with Stellar magazine, and said she was thrilled because she wanted a ‘new journey’ with Justin.

‘I always thought I was going to have a boy. I knew I was going to be a boy mum,’ she said. 

‘Justin has two beautiful little girls, so having a boy, it’s like a whole new journey together.

‘[The baby] is going to be his little best mate.’

She said she previously kept details of her pregnancy private, but was ready to share her journey.

‘I keep a lot of my life private and I don’t share a lot online anyway, so [being pregnant] wasn’t really something that I was going to share online,’ she said.

This is the model’s first child with the billionaire Merivale owner, 52. He shares two daughters – Alexa, nine, and Saachi, seven – with his ex-partner Kate Fowler

Madeline showed off her big baby bump as she arrived back to Justin’s $100m Vaucluse mansion back in May

‘I haven’t posted about it and it’s been nice to have some quiet time off Instagram.

‘But obviously because I am in the public eye and we do get photographed quite a lot, I think now I’m at this point in my pregnancy where it’s nice for me to be able to share some nice photos’.

Madeline also revealed she has sought advice from her older sisters Anna and fellow model Simone, who both have had children.

In November, an insider confirmed the exciting news of Madeline’s pregnancy to Daily Mail Australia.

They revealed a friend of Justin’s recently moved out of his Vaucluse mansion to make room for their growing family.

The business mogul, who has a net worth of $1.39billion, began dating Madeline in 2019 when she was 22 and he was 47 after his split from Fowler in 2018. 

Madeline is the younger sister of fellow Aussie model Simone Holtznagel, who welcomed her first child, a daughter called Gia, in March 2024 with her now-ex-boyfriend Jono Castano.

In November, an insider confirmed the exciting news of Madeline’s pregnancy to Daily Mail Australia and revealed a friend of Justin’s recently moved out of his Vaucluse mansion to make room for their growing family 

Justin shares two daughters – Alexa, nine, and Saachi, seven – with his ex-partner Kate Fowler (pictured)

Justin and Madeline have gone from strength-to-strength since going public in 2019 and even sparked engagement rumours in June 2023.

Eagle-eyed fans noticed Madeline was wearing a ring on her wedding finger as they questioned whether Justin had popped the question.

A picture showed her sporting the jewellery as she cuddled up to Justin while enjoying a bowl of Udon noodles together at a restaurant in Japan.

But the bling appeared to be an emerald and diamond promise ring, and another photograph showed her wearing a different ring on the same finger as she posed for a selfie.