Heidi Klum (50) splashes around in a skimpy black bikini and kisses on vacation in St. Barts with husband Tom Kaulitz (34)

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

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 bottoms, which tied at the side.

The cheeky swimwear exposed the beauty’s perky bum as she soaked up the sun over the bank holiday weekend.

Klum and Kaulitz, who is also from Germany, appeared to be having a great time as they enjoyed a Christmas reindeer float.

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

Heidi Klum (50) looked incredible in a skimpy black bikini as she and her husband Tom Kaulitz (34) on the beach in St. Barts frolicked

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

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

The America’s Got Talent judge wore subtle jewelry as she splashed around in the ocean

Heidi beamed as she wore glossy round sunglasses to shield her eyes from the harsh sun.

Her blonde hair, with her signature shaggy bangs, was loose and wavy after being dry from soaking in the salty ocean water.

The unapologetic beauty looked gorgeous despite wearing no makeup.

Tom, who is part of the band Tokio Hotel, wore a silky golden yellow shirt and printed shorts to match.

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 offspring: daughter Leni (19) and sons Henry (18), Johan (17) and Lou (14).

When the couple got tired of the sea, they got dressed and left for their next activity.

Klum and Kaulitz, who also hails from Germany, appeared to be having a great time as they enjoyed a Christmas reindeer float

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

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

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

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 soaked up the sun over the holiday weekend

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

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

Klum sunbathes her bum while floating in the turquoise sea

When the couple got tired of the sea, they got dressed and left for their next activity

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

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

Kaulitz spun the 6-foot-tall superstar around before they embraced while listening to Silk Sonic’s “Leave The Door Open.”

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

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