The Duke and Duchess of Cambridge wore 3D glasses as they watched a "groundbreaking" new film by naturalist and broadcaster Sir David Attenborough.
William and Kate attended the premiere of Natural History Museum Alive 3D, which sees Sir David hide away inside the museum after dark, only to find its exhibits coming to life around him.
The film, which will be broadcast on Sky at 6.30pm on New Year's Day, features dinosaurs, giant apes, and 118ft snakes, with the evergreen naturalist explaining how scientists can understand their lives by studying their bones.
The Duchess, wearing a floor-length black lace Alice Temperley dress, chatted and joked with Sir David in the main hall of the Natural History Museum in the shadow of a Megatherium skeleton - or giant ground sloth - which exits the film by burrowing its way out of the cafe.
The event was Kate's first engagement as patron of the museum in London's Kensington.
The couple then took their seats with 300 other guests in the main hall, under the whip-like tail of the museum's reproduction Diplodocus skeleton "Dippy".