Both Madonna and Red Hot Chili Peppers frontman Anthony Kiedis signed up as investors in Vita Coco, described as one of the fastest growing beverage brands in America, at the beginning of 2010 alongside Hollywood actors Matthew McConaughey and Demi Moore.

"With summer's hottest days right around the corner, consumers are following Rihanna and Madonna's lead in choosing Vita Coco as their all-natural source of hydration," stated the brand.

"Rihanna is a natural fit for the Vita Coco brand and ...