This month she gave a glimpse of her enviably toned legs while watching her husband, Prince William
, on the polo field.
And now the Duchess Of Cambridge
's purse-friendly fitness secret has been revealed.
According to reports a ?13 workout consisting of a gym ball and a pair of dumbbells is behind the 30-year-old's slender physique.
Shaping up: Kate opted for a breezy silk shift as she watched her husband play in a charity polo ...