Zara Anne Elizabeth Phillips ( born 15 May 1981 ) is a British equestrian and the second-eldest grandchild of Queen Elizabeth II and Prince Philip , Duke of Edinburgh .
Zara Anne Elizabeth Phillips ( born 15 May 1981 ) , who is known as Zara Phillips , and formally as Mrs Michael Tindall , is a British equestrian and the second-eldest grandchild of Queen Elizabeth II and Prince Philip , Duke of Edinburgh .