Pippa Middleton shows off her skill to boyfriend James Matthews

Pippa Middleton attends the Birkenbeinerrennet ski race in Lillehammer, Norway. (Getty Images)

Pippa Middleton successfully completed the 54KM/33 mile course from Rena to Lillehammer in 5 hours 58 minutes to raise awareness for The UK's National Skier's and Boarder's Charity Disability Snowsport UK. (Getty Images)

The Birkenbeinerrenet began in 1932 and features more than 16,500 competitors. (Getty Images)