Pippa Middleton to ski 56-mile Swedish marathon for charity

Pippa Middleton is seen at the front row during the Temperley runway show at London Fashion Week, Sept. 19, 2011, in London.

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(CBS/AP) Pippa Middleton will be strapping on skis and competing in a cross-country marathon for charity on Sunday.

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The sister of Kate, the Duchess of Cambridge, is tackling Sweden's traditional 56-mile cross-country marathon, the Vasaloppet.

Pippa and her brother, James, are doing the race to raise money for the child hunger charity Magic Breakfast, according to race spokesman Per Strid.

The Vasaloppet, first held in 1922, is one of the world's oldest cross-country races. It stretches from the village of Salen near the Norwegian border to the central town of Mora. Last year 16,000 people took part.

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Pippa Middleton