The “Cambia El Paso” singer wore a flowy white sundress with short sleeves, cut-outs along the waistline, and a low-cut neckline that emphasized the necklace.
Lopez, who was cruising around the Mediterranean with Affleck, 48, before he left Italy for the U.S., was first spotted wearing the necklace three days after celebrating her birthday with the actor aboard a boat, where the two shared a rather steamy kiss.
It’s been all about relaxing and enjoying a summer break,” a source close to the couple tells PEOPLE.
Lopez wore the special jewelry in a series of photos on Instagram on her birthday — including a shot of her and Ben engaged in that passionate kiss.