Buckingham Palace tweeted today that "The Princess Royal and Captain Mark Phillips are pleased to announce the engagement of their daughter Zara Phillips to Mr. Mike Tindall."
According to The Daily Telegraph, the engagement took place yesterday evening, Monday 20 December 2010, at the couple's home in Gloucestershire. Although the wedding date has not been set yet, the news of the engagement means that there could be two royal/royalty-related weddings in the United Kingdom in 2011. Prince William of Wales' engagement to Kate Middleton was made public on 16 November 2010, and their wedding is to take place at Westminster Abbey on Friday 29 April 2011.
Miss Zara Phillips, the only daughter of the Princess Royal (Princess Anne) and her first husband Mark Phillips, and of course a granddaughter of Queen Elizabeth II, was born at St. Mary's Hospital, London on 15 May 1981. She is 12th in line of succession to the British throne and hopes to represent Great Britain as an equestrian at the 2012 Olympics in London.
Michael James Tindall was born on 18 October 1978 at Otley, Leeds as the son of Phillip Tindall and Linda Tindall, née Shepherd. He is well-known as a rugby union player representing Gloucester Rugby and England.
I gather that British genealogists are already working on the ancestry of Mike Tindall, and look forward to reading more details soon. As of today I have only found that Mike's grandmother Margaret Shepherd died in March 2006.
See also Thisisgloucester.co.uk's news article of today, Queen's granddaughter gets engaged to Gloucester Rugby skipper Mike Tindall.
Updated on Wednesday 22 December 2010 at 11.15 (link added to Gloucester Rugby's official website).