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Duchess Kate andPrince Williamwere among the most dazzling stars on the red carpet for the royal premiere ofMandela: Long Walk to Freedomon Thursday night inLondon, just hours before the beloved South African leader's death was announced.

Mandela died at age 95 in hisJohannesburghome after a long decline. A daughter,Makaziwe Mandela, said Wednesday that her father was on his "deathbed" but still fighting, according to theAssociated Press.

The Duke andDuchess of Cambridgewere told the news while they were watching the movie; William later spoke to reporters, saying the film had reminded "what an extraordinary and inspiring man" Mandela had been.

"I just wanted to say it's extremely sad and tragic news," William said according totweetsby royal reporter Richard Palmer. "My thoughts and prayers are with him and his family. It's very sad."

Royal reporter Katie Nicholl said there was a standing ovation in the theater after the movie ended.

"We were delivered the news as the credits rolled," shetweetedfrom the theater. "Silence here in the cinema where the royal couple have just watched Mandela. RIP"

Mandela death was announced inSouth Africaafter the glittery premiere of the bio-pic about him, where the Will and Kate helped raise money for one of Mandela's charities.

The duchess wore a creamy, close-fitting gown byRoland Mouretthat she has worn before, most recently at a dinner atClaridgeslast year. Her hair was pulled up and back in a loose ponytail, and there were no telltale gray strands.

Around her neck was a sparkly collar-style necklace that attracted a lot of interest among royal reporters on Twitter.

"If anyone can help ID the Duchess's blingtastic necklace tonight I would be grateful," tweeted theDaily Mail's Rebecca English.

TheRoyal Film Performanceis a fundraising event for a British charity, theCinema and Television Benevolent Fund. Also benefiting from this year's performance is the Nelson Mandela Children's Fund, which supports the children of South Africa.

Before the film, the couple met with one of Nelson Mandela's daughters,Zindzi Mandela, and with members of the cast and crew, includingIdris Elba(Nelson Mandela),Naomie Harris(Winnie Mandela), and directorJustin Chadwick.

The duchess' appearance was only slightly dressed down compared to two nights ago, when she wore a royal tiara to a white-tie diplomatic reception atBuckingham Palace.

But it was a big step up from the day before, when she wassnappedin a casual baseball cap and jeggings while walking inKensington Gardenswith Prince George in a $600 baby buggy. Her dog, Lupo, was there, too.

The baby wasn't visible in the paparazzi shot, but royalcommentatorssaid on Twitter he was ensconced in a quiltedSilver CrossElegance pram in navy blue. It'spriceybut not as pricey as some other Silver Crosspushchairs, as they are called over there, or as much as other brands such as Bugaboo.

Wearing gloves, a light jacket, a gray T-shirt and running shoes, she took a stroll in the always-bustling gardens next toKensington Palace, her new home. The pictures show other people walking nearby, seemingly unaware of her, although at one point she waves at someone off camera. Black cocker spaniel Lupo follows behind unleashed and sniffing at everything.

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