Leonardo DiCaprio and his 28-year-old girlfriend, Italian model Vittoria Ceretti, are baring it all during their Saint-Tropez yacht vacation.Earlier this week, DiCaprio and Ceretti were seen with friends, Tommaso Buti and Laura Harrier, while enjoying a dip in the Mediterranean Sea. DiCaprio, 51, was seen shirtless on the back of the boat.Most of the snaps came after the famous crew took a quick swim and boarded back on the yacht. In an image, security can be seen standing at the back of the boat while the group took a swim.DiCaprio took his white baseball hat off to go into the ocean. He then relaxed on the large boat in a pair of swim shorts and no shirt.GISELE BÜNDCHEN CELEBRATES BIRTHDAY IN LEOPARD-PRINT BIKINI AS SHE REFLECTS ON GRATITUDECeretti and DiCaprio have been romantically linked since the summer of 2023, when they were first spotted together during outings in Europe. Since then, the couple has kept their relationship largely private.LIKE WHAT YOU’RE READING? CLICK HERE FOR MORE ENTERTAINMENT NEWSThe “Titanic” actor has a long history of shorter relationships, famously with women much younger than him, but a source told People in March that his relationship with Ceretti feels “different and more serious.””He genuinely cares for her. They may not be ready to get married, but for the first time Leo is open to a serious future,” the source told the outlet at the time.CLICK HERE TO SIGN UP FOR THE ENTERTAINMENT NEWSLETTERThey added, “Vittoria also has her own life and she’s very independent, which is appealing to him, especially when he’s away for filming and has long days on set.” The source noted that DiCaprio “is much more openly affectionate with Vittoria than his friends have ever seen him be with any other girlfriends.”