Why Leonardo

Leonardo DiCaprio during press conference on &...

Leonardo DiCaprio during press conference on "The Beach" (Photo credit: Wikipedia)

When Titanic 3-D premiered in London on Tuesday, one of the epic blockbuster’s biggest stars was conspicuously absent. Kate Winslet was there. So was James Cameron, who just surfaced from a historic dive of almost 36,000 feet to the bottom of the Pacific Ocean’s Mariana Trench. But no Leonardo DiCaprio? According to a source close to the actor, DiCaprio could not attend the premiere because he’s been in Lousiana filming Quentin Tarantino’s Django Unchained. Gallery: ‘Titanic 3D’ London Premiere The film, set in the 1800s, also stars Jamie Foxx, Joseph Gordon-Levitt and Christopher Waltz.