New Vita Coco Ad with Rihanna [VIDEO]

Wanna know the key to Rihanna’s killer physique? Vita Coco water.

The 24-year-old bad girl (and spokesperson for the beverage) tells Us Weekly that it definitely helped her get a summer-ready bod. “I wasn’t drinking enough water before, and I love coconut water,” RiRi says. “It hydrates me just as much as regular water so it really started to affect my diet and the way my body was shaping up.”

Of course it’s not the only secret to her slim bod. She admits that her diet has changed as well:

“I also started to eat a little differently. I added one vegetable to each meal with my diet for awhile — but then I went right back to eating McDonald’s and pasta and stuff like that too! So really its just having a balance of eating great and staying hydrated.”

The new, Terry Richardson-shot campaign captures the Bajan singer in tropical-themed ‘fits.

Peep the pics and behind-the-scenes video below: