Pippa Middleton, brother James finish 47-mile Swedish swim-run race

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She didit! Pippa Middleton may have been exhausted, but she was smiling brightly as she crossedthe finish line at the Otillo Swimrun World Championship in Sweden on Monday. Duchess Kate's sister competed in the 47-mile race in a team that included her brother, James, and came in 82nd, completing the course in 13 hours, 4 minutes and 24 seconds.

The racecame the day after Pippa celebrated her 32nd birthday, and as she finished the race with teammate Jöns Bartholdson, she described it as "one of the hardest things I've ever done."

Pippa and her brother competed in support of the Michael Matthews Foundation, which helpsbuild schools in poverty-stricken areas around the world and is named in honorof a 22-year-old who died in an accident on Mount Everest. Michael's olderbrother, James, used to date Pippa and ran as James Middleton's teammate in therace.

TheOtillo race features teams of two swimming about six miles in the frigid BalticSea followed by a 40-mile trail run. "It'srelentless," Pippa told Reuters."Much of the running is trail running on uneven ground, hopping over rockson the shore line, dipping in and out of bays."

Pippa,who has previously taken part in a 300-mile bike race across the U.S. and a marathon in Kenya,described the Otillo as "an unusual and unique event, not for thefaint-hearted," but said that she "was taken by the idea of competingin the stunning surroundings" of the Swedish archipelago islands.