Leighton Meester wore a bikini to hit the beach in Rio yesterday with her new man. Leighton's boyfriend Aaron Himelstein was shirtless for the swimming session, and the couple showed plenty of PDA while out in the water and together on the sand. Leighton and Aaron are enjoying a Brazilian vacation that's included plenty of sightseeing and even meeting with some of her South American fans. She was able to get away now that filming the current season of Gossip Girl has wrapped. Next up for Leighton will be promoting her new comedy That's My Boy, which stars Adam Sandler and Andy Samberg, ahead of its June release. She's also indulging her charitable side by teaming up with the DKMS foundation, encouraging people to become blood marrow donors.