London (CNN) -- Zara Tindall, a granddaughter of Queen Elizabeth II, is pregnant with her first child, Buckingham Palace announced Monday.
The daughter of Queen Elizabeth's only daughter, Anne -- is married to rugby player Mike Tindall. When born the baby will be the queen's fourth great grandchild, after Zara's brother Peter Phillips' two children and Prince William and his wife Catherine's infant, expected in mid-July.
Zara, one of Britain's leading equestrian riders, won a silver medal at the London 2012 Olympic Games and is planning to take part in the Rio Games in 2016. She has also done work on behalf of equine and children's charities.
Mike Tindall, who has captained the England rugby side, was a member of the 2003 England World Cup winning squad. He also leads his club side, Gloucester.
The couple married in July 2011 in a ceremony staged in Edinburgh and attended by the queen and senior royals. In contrast to the wedding of Zara's cousin Prince William to Catherine Middleton -- watched by hundreds of millions of people around the world -- Phillips' wedding was a strictly private affair.
Meanwhile, St. James's Palace announced on Monday that the baby born to Prince William and the Duchess of Cambridge will hold the title His or Her Royal Highness Prince or Princess [name] of Cambridge.