Heidi Klum shows off her slender figure as she splashes in the Caribbean with an inflatable dolphin

By Bobbie Whiteman For Dailymail.com

Published: 16:10 EST, 12 August 2016 | Updated: 19:06 EST, 12 August 2016

She's kickstarted her career as a swimsuit model for Sports Illustrated.

And Heidi Klum still has the figure for it, even though she's now 43.

The former supermodel showed off her slender and lithe body as she splashed around with her kids and an inflatable blue dolphin in the warm waters of the Caribbean on Tuesday.

A life aquatic: Heidi Klum floated on her children's inflatable dolphin as she splashed in the warm Caribbean on Tuesday 

A life aquatic: Heidi Klum floated on her children's inflatable dolphin as she splashed in the warm Caribbean on Tuesday 

The German-born beauty opted for a blue and white striped halter neck swimsuit rather than the teeny bikinis she usually wears.

Maybe she was worried about a possible wardrobe malfunction as she played in the warm waves with Henry, 10, Johan, nine, and six-year-old Lou.

She shares the cuties with her ex-husband, Brit musician Seal. 

Slender and lithe: She's famous for kickstarting her career as a swimsuit model for Sports Illustrated and the German-born beauty still has the figure for it, even though she's now 43

Sitting in the surf: The beautiful blonde enjoyed the shallows as her six-year-old daughter Lou took her turn with the dolphin

Sitting in the surf: The beautiful blonde enjoyed the shallows as her six-year-old daughter Lou took her turn with the dolphin

Hitching a ride: Her oldest boy, 10-year-old Henry, jumped on his mum's back

Hitching a ride: Her oldest boy, 10-year-old Henry, jumped on his mum's back

There was no sign of her oldest daughter, Leni, 12, whose father is Renault Formula 1 team director Flavio Briatore, and whom Seal adopted at birth.

Aside from the dolphin, the family also took an orange waveboard and a large yellow rubber ring to play with in the sea.

Heidi helped Lou wrangle the ring before relaxing in it herself. 

Booty-ful view: The Project Runway host showed off her derriere as she bent over the waveboard on the water's edge

Booty-ful view: The Project Runway host showed off her derriere as she bent over the waveboard on the water's edge

Fun with mum: A smiling Heidi helped Lou with the huge yellow rubber ring

Fun with mum: A smiling Heidi helped Lou with the huge yellow rubber ring

Sitting pretty: The six-year-old, who looked cute in a pink bikini, managed to tame the tricky marine mammal

Sitting pretty: The six-year-old, who looked cute in a pink bikini, managed to tame the tricky marine mammal

Making a splash: Heidi held her face in her hands in mock horror as Johan, nine took a tumble

Making a splash: Heidi held her face in her hands in mock horror as Johan, nine took a tumble

The Project Runway host also had fun with the dolphin, lying on it as she basked in the shallows,before one of her boys jumped on his mum's back for a ride.

She waded out of the water to hand over her sunglasses to an assistant, possibly her children's nanny, before heading back in for some serious wave riding.

Her toyboy beau, art dealer Vito Schnabel, 29, didn't appear to be around on this trip.

But last month the couple enjoyed a romantic break without her children in London.

Moment of peace:  The America's Got Talent host relaxed in the rubber ring as Henry mastered the dolphin

Moment of peace:  The America's Got Talent host relaxed in the rubber ring as Henry mastered the dolphin

Surf's up: The former supermodel handed over her sunglasses to an assistant before heading back in to the Caribbean for some serious wave riding

Surf's up: The former supermodel handed over her sunglasses to an assistant before heading back in to the Caribbean for some serious wave riding

Waiting for a break: She launched her toned body onto the board

Waiting for a break: She launched her toned body onto the board

Looking rear-ly great: Her backless striped swimming costume showed off her pert behind

Looking rear-ly great: Her backless striped swimming costume showed off her pert behind