Pippa Middleton in bike race across US

Pippa Middleton is part of the Britain team racing the 3,000 miles across the US in a charity bike race.

Pippa and James Middleton are part of the Britain team racing the 3,000 miles across the US in a charity bike race

Kate Middleton’s sister is participating in the Race Across America, decked out in spandex biking gear with the British flag printed on the front.

Her bearded brother James Middleton will be racing on her team. Pippa and James Middleton were photographed training for the grueling task on Saturday, June 14.

Pippa’s backside, which became famous after she served as the maid of honor at her sister’s 2011 wedding, was on display in her tight biker shorts.

The bike race has been going on for 32 years and in that time, fewer than than 200 individuals have successfully completed the event.

[youtube A2UFKrWxVKc 650]