Eamonn McCormack/Getty Images
Zara Phillips takes part in the annual Artemis Challenge around the Isle of Wight on Aug 3, 2010 in Cowes, England. Phillips, an accomplished equestrian, is the second child of Queen Elizabeth's daughter Princess Anne and first cousin of Princes William and Harry. She is 12th in line to the throne.
Tim Ireland
Zara Phillips, right, and her fiance, rugby player Mike Tindall, after announcing their engagement, in Gloucestershire, England, Tuesday Dec. 21, 2010.
AP Photo/Tim Ireland
A view of Zara Phillips' engagement ring after her engagement was announced, in Gloucestershire, England, Tuesday Dec. 21, 2010.
AP Photo/Tim Ireland
Zara Phillips, right, and her fiance Mike Tindall, after announcing their engagement, in Gloucestershire, England, Tuesday Dec. 21, 2010.
Neil Mockford/Getty Images
Zara Phillips and boyfriend, rugby player Mike Tindall attend the Sport Industry Awards on May 13, 2010 in London.
Robert Prezioso/Getty Images
Zara Phillips is seen at the 2009 Emirates Melbourne Cup Day at Flemington Racecourse on Nov. 3, 2009, in Melbourne, Australia.
AP Photo/Sang Tan, Pool
Queen Elizabeth II, right, talks to her granddaughter Zara Phillips, sister of Peter Phillips, as they watch Peter Phillips and Canadian Autumn Kelly leave St. George's Chapel in Windsor, England, after their marriage ceremony, Saturday, May 17, 2008.
Ian Mcilgorm/AFP/Getty Images
Zara Phillips talks to cousin Prince Harry during the wedding of her brother, Peter Phillips, to Autumn Kelly at St George's Chapel in Windsor, May 17, 2008.
Chris Jackson
Zara Phillips, Prince William and Prince Harry attend the Christmas Day service at Sandringham Church on Dec. 25, 2009, in King's Lynn, England.
MAX NASH/AFP/Getty Images
Prince William, Prince Harry and Zara Phillips are seen outside Sandringham Church after the Christmas Day service on Dec. 25, 2009, in King's Lynn, England.
AP/PA/Pool
Britain's Princess Anne, Prince Harry and Zara Phillips, Princess Anne's daughter, from left, leave St Georges Chapel, Windsor England, Saturday April 9, 2005, after seeing the blessing service celebrating the wedding of Prince Charles and Camilla Duchess of Cornwall.
Tim Graham/Getty Images
Zara Phillips and fiance rugby player Mike Tindall attend day 3 of Cheltenham Races on March 15, 2007, in Gloucestershire, England.
