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She recently admitted that she never bothered to work out before landing her first highly coveted Victoria's Secret gig back in 2005. 

And Alessandra Ambrosio proved she was well and truly a fitness convert as she headed for another gruelling early morning gym session in Brentwood, California on Tuesday.

The 35-year-old supermodel showed off her lithe frame in an all-black athletic ensemble as she prepared to work up a sweat. 

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Gym bunny: Alessandra Ambrosio, 35, showed off her lithe frame in an athletic ensemble as she headed for another gruelling workout session in Brentwood, California on Tuesday

Showing her commitment to the VS lingerie company, the Brazilian beauty donned a hoodie and tight leggings from their trendy sportswear range. 

Alessandra attempted to shield her make-up free face with a pair of circular shades and tied her brunette locks into a practical high ponytail. 

The mother-of-two looked raring to go as she exited her vehicle with her phone in one hand and a chic white handbag draped across the other arm.  

Heading into the gym to hone her enviable physique, it comes as a surprise that the star previously admitted to dieting furiously.

Big fan: Showing her commitment to Victoria's Secret, the Brazilian beauty donned a hoodie and tight leggings from their trendy sportswear range

Bottoms up: Her leggings showed off her peachy posterior as she prepared to work up a sweat 

In April 2016, she told The Edit she went on a strict diet in 2008 for the VS fashion show after welcoming Anja into the world.

'I only had three months to lose all the weight. And I was on this 1,200-calorie-a-day meal-delivery service that I hated. I couldn’t do that again,' she said.

The model even admitted that she never bothered to exercise before the American lingerie giant came calling.

She said: 'In my family, no one ever worked out. It wasn’t until I did my first Victoria’s Secret show that I started exercising.

'Now that it’s a healthy, normal part of my daily routine, my kids will grow up seeing it in the same way, and I love that.' 

Natural beauty: Alessandra attempted to shield her make-up free face with a pair of circular specs and tied her brunette locks up into a practical high ponytail

Heavenly: The beauty recently stunned at Paris' Couture Fashion Week where she donned a draped Grecian-style gown which flashed a generous glimpse of both leg and sideboob

The beauty, who recently bagged a spot on the Harper's BAZAAR list for the 150 Most Fashionable Women, arrived back in the States after a glamorous few weeks in Paris for the city's Couture Fashion Week.

On one occasion, the star, who began taking modelling lessons at the tender age of 12, stunned in a draped Grecian-style gown which flashed a generous glimpse of both leg and sideboob.

She has continued to impress on the style front after returning to Los Angeles and recently bared her taut tummy in a tiny bandeau top and high-waisted trousers at the Leather & Laces party red carpet.

Meanwhile, Alessandra is currently loved-up with her fiancé Jamie Mazur.

Sexy: Alessandra recently bared her taut tummy in a tiny bandeau top and high-waisted trousers at the Leather & Laces party red carpet

The pair have been engaged since 2008 and have two children together - Anja, eight and Noah, four.

Chatting to Glamour magazine in 2015 however, the model admitted that while she is grateful for her high-flying career, her family life will always be her central focus.

She explained of her exciting opportunities in the fashion industry: 'I love that I get to travel the world and discover so many different new places and cultures.

'Making time for everything can be challenging, but I enjoy what I do, so I make it happen.'

However she added that her children will always be her main priority, continuing: '[My kids] always come first, so I try to spend as much time as possible with them. Sometimes that means rearranging my schedule or bringing them on set.' 

Smitten: Alessandra is currently loved-up with her fiancé of nine years, Jamie Mazur. They have two children together - Anja, eight and Noah, four