James and Pippa Middleton complete Race Across America

and

triumphantly completed their

in the early hours of Sunday morning.Dressed in their Union flag-themed Lycra, the siblings and their team mates were all smiles as they crossed the finish line in Annapolis, Maryland.Race Across America, a 3,000 mile cross-country trip, saw the eight-person group cycle through 12 states in six days, ten hours and 54 minutes raising money for the British Heart Foundation and the Michael Matthews Foundation.

© Photo: Getty Images

James and Pippa Middleton

James and Pippa's trip attracted much attention Stateside and

.Four days into the ride the group stopped off to refuel at a McDonald's restaurant where local residents snapped them tucking into some food.Pippa, 30, and James, 27, then both posed for photographs before loading up their bikes and jumping into a waiting black vehicle, presumably headed for a nearby hotel to get some rest.

© Photo: Getty Images

The Middleton siblings, whose elder sister is

, announced that they would undertake the challenge this month and

for the start of the race.

Having now completed the race Pippa will now sell her bike on online auction site eBay to help generate more funds. Pippa and James will show off their sporting ability again in July when they head to Istanbul to take part in the Bosphorus Cross-Continental Race Swimming Race; a 6.5 km swim across the Bosphorus Strait.