London, Feb 20 : David Cameron has defended the Duchess of Cambridge, saying that author Hilary Mantel was "completely wrong" to compare her to a "shop-window mannequin."

Mantel said at the London Review of Books Lecture that the duchess was "gloss varnished" with a "plastic smile."

The British Prime Minister added that Mantel writes great books but what she's said about Kate is completely misguided, the BBC reported.

Her speech was titled `Undressing Anne Boleyn', referencing royal women.

"What I've seen of Princess Kate at public events, at the Olympics and elsewhere is this is someone who's bright, who's engaging, who's a fantastic ambassador for Britain. We should be proud of that, rather than make these rather misguided remarks," Cameron said.

Mantel said at her speech at the British Museum on 4 February that in contrast to Diana, Princess of Wales, the duchess appeared "machine-made." (ANI)