Jennifer Lopez has denied she is pregnant.The 'Maid In Manhattan' actress revealed she has been trying for a baby for months but has so far been unsuccessful.Speaking at the Women In Film Crystal Awards she joked: "The rumours about me being pregnant are always strong and always wrong!"Lopez, who is married to Latin star Marc Anthony, also admitted she is having second thoughts about playing the role of Sue Ellen in the film adaptation of hit US series 'Dallas'.The star revealed she had spoken to John Travolta - who is rumoured to be playing her on-screen husband JR Ewing - regarding her doubts about the movie.She said: "He asked me if I was going to take the role of Sue Ellen and I said 'I think so. But nothing's set in stone'."Sue Ellen was a Texas beauty queen, so I think I can kind of fit into that."

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