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Leonardo DiCaprio on Tuesday (January 23) sent the crowds cheering at the UK premiere of "Blood Diamond". Despite freezing temperatures, hundreds turned up to catch a glimpse of the Oscar nominee who was there with co-stars Jennifer Connelly and fellow Oscar-nominee Djimon Honsou. Connelly brought along her British husband Paul Bettany while DiCaprio, arrived single. They spent almost an hour meeting the crowds. The message in new movie "Blood Diamond" is clear: know the history of a precious gem before buying it. From the early days of Hollywood, writers, directors and producers have cranked out films that addressed social or political issues, including 1915's controversial "The Birth of a Nation" and 1967's "Guess Who's Coming to Dinner," both of which dealt -- in vastly different ways -- with race in the United States. As a result, message movies are mostly made by independent filmmakers, as was this year's global warming documentary "An Inconvenient Truth." It earned 24 million dollars at U.S. box offices and became the No. 3 documentary of its kind by luring environmentally conscious audiences more than mass markets. Message films that do win big audiences and major studio backers often centre on lesser known topics or are released well after controversies were addressed by governments or other institutions. Such is the case with "Blood Diamond." However it brought good luck to its two protagonists who both received Oscar nominations: "Thank you, I'm very ...