Alessandra Ambrosio and her boyfriend take a romantic walk while on vacation in St. Barts

Alessandra Ambrosio shows off her beach body in an orange bikini on the shores of St. Barts

Alessandra Ambrosio, 40, heats up beaches of St. Barts in polka-dot bikini

Alessandra Ambrosio shows off her incredible physique in a tiny orange bikini in St Barts