LONDON - JULY 01:  Their Royal Highnesses Prince William (2nd R) and Prince Harry (C) and guests Chelsy Davy (L) and Kate Middleton (far R back) join guests in the royal box in performing a Mexican wave during the Concert for Diana at Wembley Stadium on July 1, 2007 in London, England. The Concert falls on the date that would have been the late Princess's 46th birthday and marks 10 years since her death with an event headed by Princes William and Harry to celebrate her life.  (Photo by Getty Images/Getty Images)