And she has a pretty good reason.
Queen Elizabeth may approve of her grandson's wife, but seeing her on a Vogue cover? Not so much.
According to a palace insider, Kate Middleton knows very well that Her Majesty would find nothing amusing about the Duchess dressing up in couture just so Anna Wintour could make a quick buck.
"Kate is keenly conscious that while her new grandmother-in-law may not chide her for appearing on a Vogue cover. But she would definitely not be amused, and Her Majesty is a real genius at making people squirm with simply a look or a 'tut, tut.' "The royal sourcery went on to add:
"Both William and Kate are free to be interviewed or photographed by whoever they choose…But both William and Kate feel it would be wrong for Kate to promote herself as a fashion or style icon. That's not what they are about and they take their royal duties far too seriously to, in one sense, trivialize them."We think that's a very noble and wise decision on their part.
Oh well, you can always have attention whore Michelle Obama cover Vogue again. Ha!