by Radar Staff
Just two weeks after competing in a 5k run as a part of the Blenhim Triathalon, Pippa Middleton was back pounding the pavement this weekend.
Kate Middleton's younger sister arrived in style aboard a helicopter to the starting line of the Highland Cross 2011 -- a 50 mile duathlon which takes place in the idyllic Scottish Highlands.
The 27-year-old completed the 20-mile run and 30-mile bike ride on Saturday as part of the team Affric Brats.
Wearing an all black outfit, Pippa showed off her lean and toned body, not appearing to break a sweat as she made her way toward the finish line with a smile on her face.
Her sister, The Duchess of Cambridge, and Prince William are due to arrive in the United States at the beginning of July for their first official tour since their wedding in April and Pippa is rumored to be joining them.