Prince Harry took part in a fun run while wearing a mask of his brother Prince William given to him by a fellow runner which drew cheers and laughter from the crowds, manifesting their approval and amusement.
Zara Phillips, the 30-year-old bride, dazzled the onlookers, when she arrived traditionally late, for her wedding to the England rugby star Mike Tindall, 32.
Prince William and Kate Middleton are to make Kensington Palace, the former home of Diana, Princess of Wales, their official London residence.
It was the first public appearance of the newly weds since their return from Seychelles.
All cameras were focused on Pippa Middleton as she sprinted to the finish line at the GE Blenheim Triathlon on Saturday morning.
After their honeymoon from Seychellis, the Duke and Duchess of Cambridge will attend the 10th Absolute Return for Kids (ARK) gala dinner, to benefit the Foundation for Princes William and Harry.
The newly married royal couple is to visit the US in an official capacity after their first overseas tour to Canada.
Pippa the younger sister of Kate Middleton, now the Duchess of Cambridge after her marriage to Prince William, has been the center of attraction in the recent royal wedding.