Pippa Middleton flashed a smile at the photographers during a shopping trip in London today. Pippa is fresh off her latest impressive athletic venture, having participated in a duathlon over the weekend after tackling a triathlon earlier in the month. Between work and competitions, Pippa has been very busy, and she's also dealing with being thrust into the spotlight since her sister Kate Middleton's royal wedding to Prince William in April. Pippa's love life has been the center of myriad rumors since that time, and the single Middleton sister is once again being linked to Prince Harry. Pippa and Prince Harry reportedly have cute nicknames for each other and have met up a few times on their own since the wedding. It would be a convenient pairing, and of course people around the world have been rooting for a Harry and Pippa hookup, though it's still just a rumor at this point. As for her sister, we'll be seeing a lot more of Kate and William in a week when their North American tour begins, and the newlyweds just released their first official royal visit portrait ahead of their journey to Canada and the USA.