“Titanic” star Kate Winslet should bone up on her Casper comic books. The actress, 25, has been warned she will be sharing a house she has just bought with a “friendly” ghost, Britain’s Daily Telegraph reported on Tuesday. “I hope it won’t put Kate off,” John Mappin, joint owner of the nearby Camelot Castle Hotel, told the paper. “I know people who have seen the ghost, and he is definitely friendly.” The house is reported to be on England’s southwest coast, close to the ruins of Tintagel Castle, said in legend to have been King Arthur’s Camelot. Winslet, who is married to director Jim Threapleton, 27 (their daughter, Mia, turns 1 in October), plans to renovate the house — once the home of a worker at the hotel who died about 70 years ago, the newspaper said. Mappin said some people believe that the ghost is that of the former owner. “He has been seen walking from the house to the hotel, as if he is going to work. No one has ever been frightened of him and I think he probably adds character to the house,” Mappin said.