Kristen Stewart sported a neon green bikini with dangerously dangling straps, and Robert Pattinson stripped off his shirt during a bittersweet evening on the set of Breaking Dawn on the Caribbean island of St. Thomas last Friday. It was one of their final days of filming the Twilight Saga, as the duo worked on reshoots for Bella and Edward's honeymoon. The costars and real-life couple were seen cuddling up on the sand in between takes, and Kristen and Rob passionately kissed when the cameras were rolling. Rob returned to work on the series on a break from promotion for his movie Water For Elephants. Kristen was by his side to support her man at his premiere afterparty in NYC earlier this month, and the two left together, sharing some PDA as they hopped in their car. Just a few days after the celebration, Robert and Kristen headed south to shoot the steamy scenes on the island. Rob recently told us the honeymoon was his favorite segment of the books to film, because they allowed Bella and Edward to be a normal, happy couple in love. His costar Peter Facinelli also recently dished some details about the Breaking Dawn wedding scene, saying that while they shot it on a dreary day, fans will never be able to tell when they see the "beautiful" finished product. Now, Robert Pattinson is already off on his European press tour for Water For Elephants starting with tomorrow's stop in Berlin.