Natasha Oakley and Sophia Vantuno show off their incredible physiques in St. Barts

Natasha Oakley and her younger half-sister, Sophia Vantuno, looked perfect on Monday as they soaked up the sun while on vacation in St. Barts.

The couple flaunted their sensational figures in matching bikinis from the popular brand Monday Swimwear by Natasha, 31.

Sophia, 21, was all smiles as she showed off her toned figure in a high-waisted beige two-piece suit and styled her brown hair in loose curls.

The couple flaunted their sensational figures in matching bikinis from Natasha's Monday Swimwear label.

Natasha Oakley (left) and her younger half-sister Sophia Vantuno (right) looked perfect on Monday as they soaked up the sun while on vacation in St. Barts.

The young influencer let her natural beauty shine through by opting for an understated makeup palette to highlight her tanned features.

She completed the summer look with a set of dangling earrings and white nail polish as she strolled through the clear water.

Putting her trademark pout to work, Sophia used the sunlight to her advantage as she struck a series of poses while her friends snapped photos of her.

Sophia, 21, was all smiles as she showed off her toned body in a high-waisted beige two-piece suit and styled her brown hair in loose curls.

Sophia, 21, was all smiles as she showed off her toned body in a high-waisted beige two-piece suit and styled her brown hair in loose curls.

The young influencer let her natural beauty shine through by opting for an understated makeup palette to highlight her tanned features.

The young influencer let her natural beauty shine through by opting for an understated makeup palette to highlight her tanned features.

She completed the summer look with a set of white drop earrings and white nail polish as she strolled through the shallows.

Sophia let the water crash against her as she worked her angles.

She completed the summer look with a set of dangling earrings and white nail polish as she strolled through the clear water.

Putting her trademark pout to work, Sophia used the sunlight to her advantage as she struck a series of poses while her friends snapped photos of her.

Putting her trademark pout to work, Sophia used the sunlight to her advantage as she struck a series of poses while her friends snapped photos of her.

Meanwhile, her sister Natasha came prepared for a photo shoot in various swimsuits.

The blonde bombshell began her outing in a beige swimsuit that matched Sophia’s, with just a few differences in cut.

Followed by two of her friends, she then waded waist-deep in water and drenched her locks before posing for a series of Instagram-worthy snaps.

The genetically blessed sisters kept their belongings on the sand with their friends as they changed into their swimsuits for the photo shoot.

The genetically blessed sisters kept their belongings on the sand with their friends as they changed into their swimsuits for the photo shoot.

Sophia's older sister Natasha came prepared for a photo shoot in various swimsuits.

Sophia’s older sister Natasha came prepared for a photo shoot in various swimsuits.

Natasha then went a step further and went through a complete outfit change, switching to emerald green bathers before continuing on with her photo shoot.

The veteran influencer, who grew up in Sydney but now lives in Los Angeles, gained a following when she started the blog ‘A Bikini A Day’ with her best friend Devin Brugman in 2012 as a way to share her favorite swimwear.

The website took off and the couple launched their own swimwear brand, Monday Swimwear, followed by a sportswear arm, Monday Active.

The blonde bombshell began her outing in a beige swimsuit that matched Sophia's, with just a few differences in cut.

The blonde bombshell began her outing in a beige swimsuit that matched Sophia’s, with just a few differences in cut.

Followed by two of her friends, she then waded into waist-deep water and drenched her locks before posing for a series of Instagram-worthy snaps.

Followed by two of her friends, she then waded into waist-deep water and drenched her locks before posing for a series of Instagram-worthy snaps.

Natasha went back and forth to make sure her photos were correct.

Natasha went back and forth to make sure her photos were correct.

She is pictured here wearing one of her Monday Swimwear clothing brand outfits.

Natasha's friends followed closely as they helped her with her shoot.

She is pictured here wearing one of her Monday Swimwear clothing brand outfits.

At one point, the blonde tied her hair up in a bun and donned a sarong while her friend adjusted her bikini top.

At one point, the blonde tied her hair up in a bun and donned a sarong while her friend adjusted her bikini top.

In 2017, Natasha came under fire for sharing a photo of her half-sister Sophia, who was 16 at the time, posing in a bikini.

In the photo, Sophia is shown sitting on a lounge chair at a beach destination.

Several of Natasha’s followers took to the comments section of her A Bikini A Day page to debate whether it was appropriate to share such an image of a 16-year-old.

Natasha then went a step further and went through a complete outfit change, switching to emerald green bathers before continuing on with her photo shoot.

Here she is shown enjoying a sunbath while her friends and sister took pictures of her.

Natasha then went a step further and went through a complete outfit change, switching to emerald green bathers before continuing on with her photo shoot.

Once the photos were taken, Tash inspected them carefully.

Once the photos were taken, Tash inspected them carefully.

The veteran influencer, who grew up in Sydney but now lives in Los Angeles, gained a following when she started the blog 'A Bikini A Day' with her best friend Devin Brugman in 2012 as a way to share her favorite swimwear.

The veteran influencer, who grew up in Sydney but now lives in Los Angeles, gained a following when she started the blog ‘A Bikini A Day’ with her best friend Devin Brugman in 2012 as a way to share her favorite swimwear.

The website took off and the couple launched their own swimwear brand, Monday Swimwear, followed by a sportswear arm, Monday Active.

The website took off and the couple launched their own swimwear brand, Monday Swimwear, followed by a sportswear arm, Monday Active.