Nina Dobrev is the queen of bikinis. Dobrev, 36, showed off her washboard abs while dancing on a yacht during her fun-filled getaway to the Caribbean. In the reel featuring Diana Ross' hit song "Upside Down," which she shared via Instagram on Monday, January 5, Dobrev first rocked a spotted two-piece featuring a triangle top adorned with blue and brown beads on her halter straps and matching bottoms.