Payday! Kayla Itsines buys a new Mercedes in Adelaide after selling her fitness platform Sweat for $400million

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Fitness entrepreneur Kayla Itsines just sold her Sweat workout business to an American software giant for $400million.

And to celebrate the record-breaking payday, the 30-year-old mother of one treated herself to a new set of wheels on Friday.

Kayla visited a Mercedes dealership in Adelaide while accompanied by her sister Leah and a group of friends. 

Pay day! To celebrate the record-breaking sale of her Sweat workout business, Kayla Itsines (left, with a nanny and her daughter Arna) treated herself to a new set of wheels on Friday

She dressed casually in a charcoal tracksuit with white socks and sneakers.

Kayla was also joined by her two-year-old daughter Arna, whom she shares with her ex-fiancé and business partner Tobi Pearce, and a nanny.

The celebrity trainer was clearly in a happy mood as she arrived at the dealership.

Luxury shopping trip: The 30-year-old mother of one visited a Mercedes dealership in Adelaide while accompanied by her sister Leah and a group of friends

Excited: The celebrity trainer was clearly in a happy mood as she arrived at the dealership

Someone's happy! Kayla threw an arm around a male friend's neck and playfully wrestled him as they strolled into the showroom

Kayla threw an arm around a male friend's neck and playfully wrestled him as they strolled into the showroom.

After spending half an hour inside the dealership, the Sweat co-founder emerged carrying a set of keys, ready to drive off in her new car.

Kayla chatted to the Mercedes sales team and even took a few photos of her smiling daughter.

Sporty chic: She dressed casually in a charcoal tracksuit with white socks and sneakers

Keys to the kingdom: After spending half an hour inside the dealership, the Sweat co-founder emerged carrying a set of keys, ready to drive off in her new car

Kayla looked very happy with her purchase: a shiny black Mercedes. 

Notably absent from the shopping trip was Kayla's new boyfriend, known as Mitch G.

Mitch and Kayla have been dating for several months, but the notoriously private businesswoman has yet to comment on the relationship.

Ready to ride: Kayla waited patiently as the Mercedes staff prepared her new vehicle

Conversation: Kayla appeared to be in a good mood as she chatted to the sales team

Kayla confirmed she had found love again in an interview with Australian Women's Health in May, but stopped short of revealing the mystery man's identity. 

'It's early days, so I won't share too much. But I'm super happy. We have a strong sense of family and a love for fitness [in common],' she said.

Kayla confirmed her split from Tobi, who is Arna's father, in August last year. 

The former couple, who were together for eight years, co-founded the Bikini Body Training Company - later renamed Sweat - after meeting in late 2012.

Smile for mum! She even took a few photos of her smiling daughter

Where's her beau? Notably absent from the shopping trip was Kayla's new boyfriend, Mitch G

The business partners sold their health and fitness empire for $400million, according to The Courier Mail on Tuesday.

The company was bought by U.S. software giant iFIT Health & Fitness Inc.

In 2020, the Sweat app generated a staggering $99.5million in revenue, with the majority of sales coming from the American market.

Despite the company changing hands, the young millionaires will continue to manage the business from its headquarters in Adelaide. 

Tight-lipped: Mitch and Kayla have been dating for several months, but the notoriously private businesswoman has yet to comment on the relationship 

Massive deal: Kayla and her ex-partner Tobi Pearce (left) sold their Sweat fitness empire to U.S. software giant iFIT Health & Fitness Inc for $400million

Tobi told The Australian they remain committed to leading the brand from Australia.

'Kayla and I have had a very strong and long working relationship and this is the beginning of chapter two for both of us,' he said.

'I'm very much looking forward to a bigger and better Sweat – our headquarters will remain in Adelaide and we have a second office in Melbourne and that will reman there as well,' he added.

Staying in Australia: Despite the company changing hands, the young millionaires will continue to manage the business from its headquarters in Adelaide

Kayla and Tobi were ranked joint fifth on the Australian Financial Review's Young Rich List for 2018, making them the wealthiest self-made twentysomethings in Australia.

That year, Forbes estimated the then-couple's shared net worth to be $696million.

The Sweat fitness program helps people transform their bodies and achieve dramatic weight loss at the gym or from home.

At the time of their separation last year, Kayla said in a statement that she and Tobi would remain friends and business partners.

Success stories: Kayla and Tobi (pictured with their daughter Arna) were ranked fifth on the AFR's Young Rich List for 2018, making them the wealthiest twentysomethings in Australia