Holly Willoughby has admitted that she used to "lick cupcakes" because of her buttercream craving while pregnant with her children.The admission came as she and co-host Phillip Schofield tucked into a delicious chocolate fudge cake while chatting to celebrity chef James Martin about his new cookbook, Butter, on Tuesday's instalment of This Morning. "I know you're a big fan of buttercream," James told Holly, to which she responded: "It's my favourite thing in the world".