Heidi Klum, 50, sizzles in a tiny black bikini on a beach in St. Barts as she packs on the PDA with her rocker husband Tom Kaulitz, 34

Heidi Klum, 50, sizzled in a tiny black bikini on a St. Barts beach and packed on the PDA with her rocker husband Tom Kaulitz, 34.

The model and her guitarist husband, who hails from her native Germany, strolled hand-in-hand along the beach.

Heidi showed off her age-defying figure in her tiny swimwear which she paired with large sunglasses.

The lovebirds then splashed around with an inflatable reindeer and shared a laugh in the warm Caribbean sea.

Tom wore pink and green shorts with a diamond pattern and blue flowers, as well as an orange baseball cap.

Heidi Klum, 50, sizzled in a tiny black bikini on a beach in St. Barts on Christmas Day as she packed on the PDA with her rocker husband Tom Kaulitz, 34

The model and her guitarist husband, who hails from her native Germany, strolled hand-in-hand along the beach

The model and her guitarist husband, who hails from her native Germany, strolled hand-in-hand along the beach

The model showed off her age-defying figure in her tiny swimwear which she paired with large sunglasses

The model showed off her age-defying figure in her tiny swimwear which she paired with large sunglasses

In the sea, Heidi lay on top of the bouncy castle and started kicking hard and fast, but noticed that she was making no progress.

She turned around and saw Tom, who had been holding the reindeer toy tightly in his hand the entire time, preventing Heidi's movement.

Heidi got off the reindeer and Tom, who had been swimming a little further away, said something to her that she did not understand.

She walked over to Tom, who held her hand and repeated what he said, leaving Heidi in hysterics.

Heidi then turned her attention back to the bouncy castle and Tom offered to drag it for her.

Heidi made sure she stayed hydrated in the 24 degree weather and kept a bottle of water as she returned to shore.

The model and Tom have been married since 2019.

Tom is now the stepfather to Heidi's four children – Leni, 19, Henry, 18, Johan, 17, and Lou, 14 – with ex-husband Seal.

Then the lovebirds splashed around with an inflatable reindeer and shared a laugh in the warm Caribbean sea

Then the lovebirds splashed around with an inflatable reindeer and shared a laugh in the warm Caribbean sea

Tom wore pink and green shorts with a diamond pattern and blue flowers, as well as an orange baseball cap

Tom wore pink and green shorts with a diamond pattern and blue flowers, as well as an orange baseball cap

Heidi lay down on top of the bouncy castle and started kicking hard and fast, but noticed that she was making no progress

She turned around and saw Tom, who had been holding the reindeer toy tightly the entire time, preventing Heidi's movement.

Heidi lay down on top of the bouncy castle and started kicking hard and fast, but noticed that she was making no progress

Heidi held the bouncy castle tightly as she looked at Tom who had just said something to her

Heidi held the bouncy castle tightly as she looked at Tom who had just said something to her

She then left it and went to Tom, who held her hand and repeated what he said, leaving Heidi in hysterics

She then left it and went to Tom, who held her hand and repeated what he said, leaving Heidi in hysterics

Heidi then turned her attention back to the bouncy castle and Tom offered to drag it for her

Heidi then turned her attention back to the bouncy castle and Tom offered to drag it for her

As they neared the beach, Heidi looked down at her toned body while Tom kept his gaze on the shore

As they neared the beach, Heidi looked down at her toned body while Tom kept his gaze on the shore

Heidi made sure she stayed hydrated in the 24 degree weather and kept a bottle of water as she returned to shore

Heidi made sure she stayed hydrated in the 24 degree weather and kept a bottle of water as she returned to shore