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Talk about turning up the heat! Not only have these two lovebirds gotten a room, but they can't wipe the giddy smiles from their smug and sexy faces!

Robert Pattinson and Kristen Stewart were snapped on the balcony of their hotel in Rio de Janeiro, Brazil this afternoon, where they are filming some scenes for Breaking Dawn. Earlier in the day we snapped Rob on set with a Bella lookalike, and the hunky Brit didn't look nearly as enthusiastic about working with her as he did with his real life lady love. Can you blame him?