Newly-engaged Serena Williams showcases killer curves and athletic physique in Berlei sportswear...

She and her beau Alexis Ohanian announced their engagement in December.

And Serena Williams proved why she caught the Reddit co-founder's attention on Tuesday, as she showed off her sensational figure in new modelling for Berlei.

The 35-year-old displayed her impressive muscle tone as well as her killer curves as she posed confidently in just a sports bra and control pants for the sexy new shots.

Stunning: Serena Williams, 35, proved why she caught her fiancé's attention on Tuesday as she showed off her sensational figure in new modelling shots for Berlei

The star oozed confidence as she showed off her envy-inducing curves for all to see in the sultry new modelling shots for the brand.

She first posed in a black and white sports bra, which plunged low to flash her assets, and teamed it with hot pants which cinched in at her womanly waist.

Poising a hand on her hip, the Michigan native's impressively toned and strong arms then came into focus as she posed fiercely for the cameras.

Toned: She later swapped to a pink floral sports bra as she faced front on in her next shot, adding a feminine touch and displaying her rippling abs more clearly to the camera

She later swapped to a pink floral sports bra as she faced front on in her next shot, adding a feminine touch and displaying her rippling abs more clearly to the camera.

The last steamy photo saw her clad in a white sports top, which cut into a very low V to give a glimpse of her plentiful cleavage, and a stylish pink bomber jacket which she draped casually and effortlessly her arms.

She accessorised with only a delicate heart necklace and left her hair and make-up fresh - to emphasise her natural beauty and show off her gorgeously clear complexion.

Chic: The last photo saw her clad in a white sports top, which cut into a very low V to give a glimpse of her plentiful cleavage, and a pink bomber jacket which she draped over her arms

Serena has been named the front woman of the brand's Do It For Yourself campaign, and representative of their new AW17 collection.

The shots are not the first time the athlete has sizzled in the sports wear however - as she was seen wearing the garments at a dance class last week in Melbourne, ahead of the Australian Open.

Sporting a multicoloured bra from the new Berlei line and black leggings, the world number two seed showed off her enviable curves as she got into the groove at the Blackman Hotel in South Yarra.

Incredible! Serena Williams, 35, left fans in awe while busting a move during a dance class in Melbourne ahead of the Australian Open on Thursday

The iconic athlete, who boasts a whopping 21 Grand Slam titles, also wore grey leg warmers and sneakers as she performed the high-energy routine.

Proving she's more than just an esteemed athlete, Serena appeared to be quite in her element as she enthusiastically danced along to an uptempo track.

The performance, which slightly resembled a fitness routine, was complete with high kicks, knee raises, high jumps and clapping.

Amazing: The performance, which slightly resembled a fitness routine, was complete with high kicks, knee raises, high jumps and clapping

Work it! The world number two seed showed off her womanly curves as she got into the groove

Having a ball: Serena was pictured beaming during the high-energy routine

Dozens of fans dressed in activewear could be seen imitating the strenuous routine, which Serena managed to somehow make look effortless.

In a post shared to Instagram earlier in the day, the bubbly sister of fellow tennis great Venus Williams said for her, dancing is about 'letting myself go.'

'Sometimes we are all so serious and we forget to have fun - and I know that's me a lot of the time, but it's so important to have passions in your life that are just for you,' she captioned a Berlei sponsored dance clip.

Diverse: The line features various designs, colours and patterns to appeal to all women

'I came home. A little late. Someone had a bag packed for me. And a carriage waited. Destination: Rome,' she wrote.

'To escort me to my very own 'charming.' Back to where our stars first collided. And now it was full circle. At the same table we first met by chance. But by choice. Down on knee. He said 4 words. And I said yes.'

In response, social media entrepreneur Alexis replied: 'And you made me the happiest man on the planet.'

Looking good! Serena famously appeared in Beyonce's Sorry music video last year

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