Madeline Holtznagel, girlfriend of hospitality tycoon Justin Hemmes, rang in her 29th birthday on Saturday with an exclusive party that spared no expense.
The model – who gave birth to a son just four months ago – threw her lavish bash at The Press, her billionaire beau’s newly opened late-night Sydney hotspot.
Turning heads in a daring gold dress with a plunging neckline and thigh split, Madeline partied into the night with the crème de la crème of high society.
Madeline even suffered a nip slip on arrival, thanks to her perilously low-cut frock.
Festivities kicked off with a pre-party at Justin’s Vaucluse mansion before the group made their way to The Press, which opened under the Merivale banner last month.
Among the high-profile guests was Madeline’s older sister, Simone Holtznagel, who used the occasion to publicly debut her new romance with Joshua Clapp.
Justin Hemmes’ girlfriend Madeline Holtznagel suffered a wardrobe malfunction as she arrived at her 29th birthday party at The Press in Sydney on Saturday night
Madeline (left) was the guest of honour at her no-expense-spared party over the weekend
Several prominent society figures were in attendance, including Madeline’s older sister, Simone Holtznagel, who debuted her new romance with Joshua Clapp at the event
The couple put on a loved-up display, strolling hand-in-hand as they arrived.
Simone nearly had a wardrobe mishap herself, slipping into a glittering top with a plunging cowl neckline as she shared a passionate kiss with her new man.
Joining them were eastern suburbs ‘It’ girls Dina Broadhurst – the so-called ‘nude artist’ – and publicist-turned-Pilates instructor Bernadette Fahey.
Dina, 50, made sure all eyes were on her in a sheer lace dress.
Footage from the party showed her throwing her legs in the air and spinning on a chair, revealing a glimpse of her underwear in the process.
Bernadette, demure by comparison, added a splash of colour to the night with a patterned mini dress featuring a ruffled hem, and a pair of strappy heels.
At one stage, Bernadette was filmed dancing on a table as she performed a song with luxury fashion designer and friend-to-the-stars Michael Lo Sordo.
It marks Madeline’s first birthday since welcoming son Jaeger with Justin back in June. Justin shares two older daughters – Alexa, nine, and Saachi, seven – with his ex-partner Kate Fowler.
Madeline left little to the imagination in a plunging gold dress that featured a daring thigh split
Simone and Joshua were first introduced by Merivale CEO Justin Hemmes
The couple shared a passionate kiss outside the bar
Simone wore a sparkly top with a plunging cowl neckline
Pilates queen Bernadette Fahey added a splash of colour to the night with a patterned mini dress featuring a ruffled hem, and a pair of strappy heels
Bernadette Fahey was filmed dancing on a table as she performed a song with luxury fashion designer and friend-to-the-stars Michael Lo Sordo (left)
Madeline and Simone posed alongside Anna Cassar at the event
Simone’s new boyfriend Joshua Clapp joined in for photos
Dina Broadhurst made sure all eyes were on her in a lace dress. Footage showed her throwing her legs in the air and spinning on a chair, revealing a glimpse of her underwear in the process
A society insider first leaked news of Madeline’s pregnancy to the Daily Mail in November last year.
The source revealed that a friend and long-time houseguest of Justin’s had 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.
Before welcoming a child together, there was talk of the pair becoming engaged.
The rumours reached fever pitch in June 2023 when eagle-eyed social media followers noticed Madeline was wearing a new ring on her wedding finger.
A picture showed her sporting the sparkler as she cuddled up to Justin at an upmarket restaurant in Japan, sparking rumours of a holiday proposal.
However, it ended up being an emerald and diamond promise ring.
As for the other Holtznagel sister, the Daily Mail exclusively revealed earlier this month that Hemmes played matchmaker in pairing up Simone with Joshua.
In fact, he first introduced the two of them at The Press’ launch night last month.
Joshua, the creative force behind interior design firm Steel and Stitch, previously dated fashion designer Pip Edwards for several months from late 2024 to early 2025.
