The Canadian entrepreneur, who married Charles in 2011, likes to keep fans updated with news from their family estate in a regular newsletter.
And this week, she had a lovely announcement to make. She told followers: “It has been a very busy time on the farming front, but it’s all taking shape.
“Shifting just under 3000 acres to organic and adding grazing livestock is a big undertaking, but the growing team here at Spencer Farms has been amazing.
“It’s going to be a very busy few months with our 54 pregnant cows all due to calve between the 25th of March and the 1st of May. I CAN NOT WAIT!”
With plenty of new arrivals due in the coming weeks, Charles and Karen will certainly have their hands full. The couple takes on an active role in the estate, including major renovation work to the main property which boasts 90 rooms.
He shares four children with his first wife, Victoria Lockwood: Lady Kitty, 32, 30-year-old twins Lady Eliza and Lady Amelia, who is set to tie the knot, and Louis Spencer, Viscount Althorp, 29.
Charles went on to welcome two children with his second wife, Caroline Freud: The Hon. Edmund Spencer, 19, and Lady Lara Spencer, 17, while he and Karen – who were married on 18 June 2011 – share ten-year-old daughter Lady Charlotte Diana together.
Charles grew up at Althorp alongside three older sisters, including the late Princess Diana, but due to laws around how hereditary peerages are inherited, he became the 9th Earl Spencer following the death of his father and gained ownership of the property.