Pictures of Pippa Middleton in Highland Cross Challenge

Pippa Middleton participated in the Highland Cross challenge in Scotland today. The event goes from the West to the East Coast and includes a 20-mile run and 30-mile bike ride. Pippa and her friends had to be invited to the race, which they arrived at by helicopter. The sister of the Duchess of Cambridge also finished a triathlon in England earlier this month, though recently she's been trading her running shoes for heels to attend events. She and Kate went to a pal's wedding last weekend and Pippa joined her family for a party at the Goring Hotel. Pippa was also spotted on a casual date with her ex George Percy following the news that she had split with longtime boyfriend Alex Loudon.