Zara Tindall

Zara Tindall arrives for the celebrity golf classic drinks reception held at the South Lodge Hotel on May 20, 2013, in Horsham, England.

Britain's Queen Elizabeth II's granddaughter Zara Phillips and her husband rugby player Mike Tindall leave after attending the British royal family's traditional Christmas Day church service in Sandringham, England, Tuesday, Dec. 25, 2012. (AP Photo/Matt Dunham)

Zara Phillips riding High Kingdom speaks to her mother, Princess Anne, after receiving a silver medal after the Eventing Team Jumping Final Equestrian event on Day 4 of the London 2012 Olympic Games at Greenwich Park on July 31, 2012, in London.

Olympic torchbearer Zara Phillips arrives on her horse Toy Town as she brings Olympic flame to Cheltenham Racecourse on May 23, 2012, in Cheltenham, England.

Zara Phillips warms up on her horse "Lord Lauries" prior to competing in the dressage phase of the competition on day 1 of the Military Boekelo-Enschede 2011 on October 6, 2011, in Boekelo, Netherlands.

Zara Phillips, the eldest granddaughter of Britain's Queen Elizabeth II, arrives for her wedding to England rugby player Mike Tindall at Canongate Kirk in Edinburgh, Scotland, on July 30, 2011.

Mike Tindall and Zara Phillips attend Wireless with Barclaycard at Hyde Park on July 1, 2011, in London.

Zara Phillips and Mike Tindall leave their pre-wedding party on the Royal Yacht Brittania on July 29, 2011, in Edinburgh, Scotland.

Zara Phillips takes part in the annual Artemis Challenge around the Isle of Wight on Aug. 3, 2010, in Cowes, England.

Zara Phillips arrives to attend the royal wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011, in London.

In this April 27, 2009, file photo, Zara Phillips, Queen Elizabeth II's granddaughter, and British rugby player Mike Tindall, are seen before taking part in the "Ante Up for Africa" European celebrity charity poker tournament in Monaco.

Zara Phillips, right, and her fiance Mike Tindall, after announcing their engagement, in Gloucestershire, England, Dec. 21, 2010.

Zara Phillips, Prince William and Prince Harry arrive to attend the Christmas Day service at Sandringham Church on Dec. 25, 2009, in King's Lynn, England.

Zara Phillips, daughter of Britain's Princess Anne and granddaughter of Queen Elizabeth II, attends on March 10, 2009, the first day of the Cheltenham festival in Cheltenham. The mythic four-day National Hunt meeting serves up a feast of Grade One races, attracting the top chasers and hurdlers from Britain, Ireland and France.

Zara Phillips poses for a picture after competing on her horse Glenbuck during day one of The Land Rover Burghley Horse Trials on Sept. 4, 2008, in Stamford, United Kingdom.

British royal family member Zara Phillips..left, talks to Prince Harry during the wedding of her brother Peter Phillips 30, to Autumn Kelly 31, at St George's Chapel in Windsor on May 17, 2008.

Zara Phillips falls at the 25th jump as she competes on horse Ardfield Magic Star during cross country on day three of The Land Rover Burghley Horse Trials on Sept. 6, 2008, in Stamford, United Kingdom.

Britain's Zara Phillips, grand daughter of the queen, is seen after attending the annual Christmas day church service on Sandringham Estate in Norfolk, England Dec. 25, 2008.

Zara Phillips in the Parade ring on the first day of the Royal Ascot horse meeting Ascot, England, June, 17, 2008. The annual Royal Ascot horse race meeting spread over five days is one of the highlights of the English social season.

Zara Phillips, granddaughter of Britain's Queen Elizabeth II, walks with her horse Toytown, at Stow-on-the-Wold, England, June 9, 2008, during a photo session for the British Olympic Equestrian team.

Zara Phillips and boyfriend Mike Tindall pose with her mother, Princess Anne and step-father Vice Admiral Timothy Laurence, after she recieved an MBE from her grandmother, the queen, at Buckingham Palace on Nov. 28, 2007.

Britain's Queen's Elizabeth's grandson Peter Phillips, with his fiancee Autumn Kelly, left, and his sister, Zara Phillips, leave Westminster Abbey, London, after a service of celebration to mark the diamond wedding anniversary of Queen Elizabeth and Prince Philip on Nov. 19, 2007.