The Queen's equestrian champion granddaughter and the former England rugby player Mike Tindall are said to be "thrilled" to be expecting a younger sibling for their two-year-old daughter Mia.
Britain's Queen Elizabeth II's granddaughter Zara Tindall and her husband Mike Tindall ride in a buggy with their daughter Mia.
Source: Associated Press
The new baby, which will be Queen Elizabeth and Prince Philip's sixth great-grandchild, is due in late spring, meaning Zara Phillips is around four or five months pregnant.
Earlier this year, Mike, 38, admitted he would love more children one day.
"In the long run yes [I would like more kids], but I'm not sure when that will happen," he said.
"I don't think there's one best part [about being a dad]. It's just great, full stop, it's a lot of fun. Mia has got bundles of energy."
And the former rugby player, who married Zara in 2011, revealed his daughter loves being outside and hopes she will turn to sports one day too like himself and Zara.
"Mia is always out and about. Where we live is an outdoor lifestyle. I'd love her to be sporty but if it's not her thing she'll make those decisions," he said.
"We're there to support her in whatever she decides to do. I'd love her to play golf, it would give me a reason to go to the driving range."