Kate Middelton politely declined signing autographs at her appearance on Monday at the Chelsea Flower Show. The Princess of Wales, 41, made a surprise visit at the inaugural Children's Picnic where she shared an unspoken royal rule with a few elementary school-aged kids. "I can't write my name," Middleton said, according to People magazine, "but I can draw." The outlet reported that the princess drew a flower for a 7-year-old girl named Ruby, a tree for another young girl and a pond with flowers for another child. "My name's Catherine.