Rihanna has a thing for her "Battleship" co-star Alexander Skarsgard. She said: "Alexander Skarsgard is so hot. I had to keep my game face. I cold stare at him all day long. I was just watching him on set. He's very focused and he was really sweet." And 'sweet' is definitely a quality Rihanna should be looking for in a guy considering the last two men she has been linked to, Chris Brown and Ashton Kutcher, are known for abusing women and cheating on them