Mike Tindall and wife Zara Tindall
Mike Tindall and Zara Tindall arrive for a service of thanksgiving for Queen Elizabeth's 90th birthday at St. Paul's cathedral in London, June 10, 2016. Reuters/Ben Stansall

Queen Elizabeth II’s granddaughter Zara Tindall suffered a miscarriage, according to a representative. She and her husband Mike Tindall announced the pregnancy three weeks ago, saying they would welcome their second baby in the spring.

“Very sadly, Zara and Mike Tindall have lost their baby,” the couple’s representative said. “At this difficult time, we ask that everyone respects their privacy.”

The representative did not say what led to the miscarriage.

The Tindalls’ baby would have been the queen’s sixth great-grandchild. The couple, who exchanged vows in 2011, is already parents to Mia, who will turn three in January.

Buckingham Palace did not comment on the matter, calling it the couples’ private matter.

The 35-year-old Zara and 38-year-old Mike were last seen in public Dec. 20, in a car heading to a Christmas lunch hosted by the queen for the royal family members at Buckingham Palace, London.

Zara does not hold a royal title. Her mother is the queen’s daughter Anne, Princess Royal, who is second of her four children. Zara was reported to have spent Christmas with her family at their Gatcombe Park country estate home in Gloucestershire, which is Anne’s residence.