Pippa Middleton landed at London's Gatwick airport with her bags in tow on Sunday. She returned home following a trip to Scotland where Pippa participated in the Highland Cross Duathlon over the weekend. The sister of Princess Catherine completed the 20-mile run and 30-mile bike ride in just over five hours. It was her second endurance event of the month after competing in the GE Blenheim Triathlon. Pippa's active schedule helps her maintain the fit figure that garnered so much attention during the royal wedding, and she's been showing off her shape in stylish outfits ever since. It'll be Kate's turn to take back the spotlight soon, though, since her and Prince William's visit to North America is coming up in just a few days.