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Madonna talks about royal film at London premiere

Madonna has told reporters at the UK premiere of W.E., the second feature film that she has directed, was a "real challenge."

W.E. looks at the life of Wallis Simpson, the woman with whom King Edward VIII fell in love in the 1930s and for who he abdicated the throne to marry.

The film screening took place as part of the 55th BFI London Film Festival.

Go to next video: Madonna on Simpson and sound bites