Pippa Middleton showcased her fashion prowess as she enjoyed a walk with her two-year-old son Arthur in London. The Duchess of Cambridge's younger sister, 37, looked effortlessly stylish when heading out in the British capital with her son today. Pippa, who welcomed her second child Grace Elizabeth Jane with husband James Matthews last month, sported a long-line cream coat during the walk this afternoon. She teamed the statement garment with white trainers and an elegant polka dot dress, which featured white stripes along the hem. Pippa Middleton (pictured) showcased her fashion prowess as she enjoyed a walk with her two-year-old son Arthur in London