Heidi Klum 50 splashes around in a skimpy black bikini

Heidi Klum, 50, splashes around in a skimpy black bikini and shares a kiss with husband Tom Kaulitz, 34, during their vacation in St. Barts

Heidi Klum looked amazing in a black string bikini as she frolicked on the beach in St. Barts with her husband Tom Kaulitz.

The 50-year-old German supermodel, who went shopping with her husband in Los Angeles earlier this month, showed off her cheeky cleavage in her triangle top and matching pants that tied at the side.

The cheeky swimwear exposed the beauty's perky bum as she enjoyed the sun over the bank holiday weekend.

Klum and Kaulitz, who is also from Germany, looked like they were having a wonderful time as they doodled while enjoying a Christmas reindeer floatie.

The mother of four sported a sexy, shiny red manicure that was filed long and pointed.

Heidi Klum looked amazing in a black string bikini as she frolicked on the beach in St. Barts with her husband Tom Kaulitz Heidi beamed as she wore a pair of glamorous round sunglasses to protect her eyes from the harsh sun

Heidi Klum, 50, looked amazing in a black string bikini as she frolicked on the beach in St. Barts with her husband Tom Kaulitz, 34

The German supermodel showed off her cheeky cleavage in her triangle top and matching bottoms, which tied at the side

The German supermodel showed off her cheeky cleavage in her triangle top and matching bottoms, which tied at the side

The mother of four sported a sexy, shiny red manicure that was filed long and pointed

The mother of four sported a sexy, shiny red manicure that was filed long and pointed

The America's Got Talent judge wore subtle jewelry while splashing in the ocean

The America's Got Talent judge wore subtle jewelry while splashing in the ocean

Heidi beamed as she wore a pair of glamorous round sunglasses to protect her eyes from the harsh sun.

Her blonde hair, with her signature shaggy bangs, was loose and wavy after drying in the salty sea water.

The outrageous beauty looked stunning despite not wearing any make-up.

For his part, Tom, who is part of the band Tokio Hotel, wore a silk golden yellow printed shirt and shorts combination.

When he went into the water with his wife, whom he married in 2019, he wore light green and blue patterned swimming trunks.

He was handsome with long brown hair flowing down his back and a full, dark beard.

Missing from the scene were the former Victoria's Secret model's descendants: daughter Leni, 19, and sons Henry, 18, Johan, 17, and Lou, 14.

When the couple got tired of the sea, they got dressed and headed off to their next activity.

Klum and Kaulitz, who is also from Germany, looked like they were having a wonderful time as they doodled while enjoying a Christmas reindeer floatie

Klum and Kaulitz, who is also from Germany, looked like they were having a wonderful time as they doodled while enjoying a Christmas reindeer floatie

Missing from the scene were the former Victoria's Secret model's descendants: daughter Leni, 19, and sons Henry, 18, Johan, 17, and Lou, 14

Missing from the scene were the former Victoria's Secret model's descendants: daughter Leni, 19, and sons Henry, 18, Johan, 17, and Lou, 14

Tom was handsome, with long brown hair flowing down his back and a full, dark beard

Tom was handsome, with long brown hair flowing down his back and a full, dark beard

When he went into the water with his wife, whom he married in 2019, he wore light green and blue patterned swimming trunks

When he went into the water with his wife, whom he married in 2019, he wore light green and blue patterned swimming trunks

Heidi flashed her mega smile as she floated in the sea with her husband nearby

Heidi flashed her mega smile as she floated in the sea with her husband nearby

The beauty walked along the beach and showed off her endless legs as she got sandy

The beauty walked along the beach and showed off her endless legs as she got sandy

The cheeky swimwear exposed the beauty's perky bum as she enjoyed the sun over the bank holiday weekend

The cheeky swimwear exposed the beauty's perky bum as she enjoyed the sun over the bank holiday weekend

When Heidi isn't spending time with her children or husband, she appears on America's Got Talent Heidi rose to fame as a catwalk regular in the late 1990s

When Heidi isn't spending time with her children or husband, she appears on America's Got Talent

The beauty stretched out on her floatie on a pile of sand

The beauty stretched out on her floatie on a pile of sand

Klum sunbathed her bum while floating in the turquoise sea

Klum sunbathed her bum while floating in the turquoise sea

When the couple got tired of the sea, they got dressed and headed off to their next activity

When the couple got tired of the sea, they got dressed and headed off to their next activity

Heidi showed off her chic style with a sheer black cover-up and carried a metallic silver bag

Heidi showed off her chic style with a sheer black cover-up and carried a metallic silver bag

Over Thanksgiving weekend, Heidi also took to social media to share footage of herself dancing with Tom in her kitchen as they cooked and enjoyed wine together.

Kaulitz spun the 5-foot-10 superstar around before they hugged while listening to Silk Sonic's “Leave The Door Open.”

Klum was previously married to British singer Seal from 2005 to 2014 and he remained in their daughter Leni's life.

The exes, who were married for nine years, also share their three sons.