Nina Dobrev has been showing off quite a few bikinis while vacationing with friends in Mexico. She's slipped into a sporty halter in blue, a leaf print ensemble, and one red two-piece that fit her like a glove. But her latest design is a combination look — it's an OYE Swimwear Agatha maillot ($149, originally $350) in a sophisticated cut with the sexiest detail: transformable zippers. When Nina turned around, we saw that you can't remove the midriff section of her suit entirely, but you can alter the suit slightly if you're sunbathing and want to avoid certain tan lines. Nina accessorized her beach outfit adorably, with gold rim aviators, a striped headband, and printed sandals. You can get a closer look at her magical number ahead, then shop inspired one-pieces with zippers or cutouts in just the right places.