See a photo of Tyra Banks wearing a bikini and covering her curves with a sarong while on vacation in the Caribbean on Aug. 25. Credit: TRB/FAMEFLYNET PICTURES

Tyra Banks still knows how to work a bikini! The 39-year-old supermodel stepped out in sexy swimwear while on vacation with friends in the Caribbean on Sunday, Aug. 25.

The America's Next Top Model host styled a low-cut, black-and-gold string bikini top, but kept the bottom covered up by a gold sarong. Banks, looking slim and toned, relaxed in the sun on a lounge chair and sipped a tropical cocktail.

Earlier this month, Banks told Us Weekly that she doesn't "believe in diets" and prefers her body to be a little curvier.

"To me, it's like, I lost weight a couple of years ago and that just changed the way I ate, it changed the way I thought. I actually got too thin because I have tunnel vision," she told Us. "So when they said this is what you have to do, I was too strict, and I realized I needed to cheat way more because it didn't look good. I didn't realize I was too thin until I started seeing pictures and I thought, 'Oh, I don't like that. That doesn't look good.' I need some ass."

But the model also said that likes to keep her behind covered up. "I have too much cellulite right now," she said. "The shape is fine, but, honey, I have on stockings! I can't do short skirts without stockings anymore, so I don't like that."