Watch as The Duchess of Edinburgh is caught Drink Driving and laughs about it... 

Lady Louise Windsor can't contain her giggles as Duchess Sophie plays carriage drinking game
The Duchess of Edinburgh was a good sport at the Sandringham Driving Horse Trials. Sophie, 59, showed she was a good sport as she deftly picked up the glass of sparkling water from the stand as she swept past in her carriage, before holding it between her teeth.