Heidi Klum [1] got the best of both worlds in St. Barts on Saturday, relaxing on the beach and taking to the open sea on a yacht. The supermodel was joined by her boyfriend, art dealer Vito Schnabel, with whom she cuddled and kissed in the sand. Aboard the yacht, Heidi took a quick shower on the deck while showing off her svelte physique in a tiny bikini. The beautiful blonde also made time for a high-speed adventure, taking a Jet Ski for a spin with a pal. Heidi and Vito aren't the only stars who have been kicking off 2015 in St. Barts — most recently, Leonardo DiCaprio hit the beach [2] with a group of bikini-clad ladies. Read on to see Heidi's fun day, and then check out her best skin-baring moments [3].