Proof, at last, that there is something that Kate Middleton can't do - make 3D glasses look good.

The Duchess and her husband both donned a pair of the multi-dimensional specs for a premiere of the new David Attenborough film - "David Attenborough's Natural History Museum Alive 3D" - at the Natural History Museum in London last night.

Maybe the happy couple should check out some of these pairs for their next 3D engagement?

Earlier in the day, the couple privately attended the South African embassy to sign a book of condolence for Nelson Mandela.