The supermodel, 53, who has been vacationing in the Caribbean with her family and her little dog Fritz, had fun splashing around the waves while clad in a barely-there thong bikini.

Heidi Klum slipped into a tiny thong bikini as she posed on a yacht while promoting her new crisps brand in an Instagram post on Wednesday.

As usual, Heidi, 53, looked nothing short of amazing as she basked in the sunshine in an itty bitty cream bikini.

The supermodel, 53, who has been vacationing in the Caribbean with her family and her little dog Fritz, had fun splashing around the waves while clad in a barely-there thong…