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Duchess Kate and Prince William turned out in fancy dress tonight for another screening, this time for the new film by David Attenborough at London's Natural History Museum.

Kate wore a lacy black gown by Alice Temperley that, as is becoming routine for her, she had worn before, most recently at a premier of the movie War Horse last year.

Their appearance followed a private visit earlier today to South Africa House to sign the book of condolences for beloved icon Nelson Mandela, who died last week at age 95.

The visit was unannounced by the palace but a passing photographer snapped pictures of Kate arriving, dressed in a black pencil skirt and matching jacket with white polka dots and simple black pumps.

On Thursday night, the couple were attending the premiere of the new biopic Mandela: Long Walk to Freedom when they were told by aides of his death. As the credits rolled, British actor Idris Elba, who plays Mandela in the film, announced the news to the audience, which included two of Mandela's daughters. There were shocked gasps, and Kate was seen with tears in her eyes. Both she and William were ashen-faced when he spoke to reporters afterwards to express condolences.

Tonight's screening at the Natural History Museum — Kate is its royal patron — was a happier occasion.

The film by the famed wildlife filmmaker is David Attenborough's Natural History Museum Alive 3D, which brings to life extinct creatures — dinosaurs, ice-age beasts and giant reptiles — in the museum through 3-D technology.

Paul Harrison, a SkyNews royal reporter, tweeted a picture of the couple sitting in the front role watching the film with goofy 3-D glasses on.

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