Kirkwood, who appeared in numerous stage shows and was the first woman to have her own television series on the BBC, left over £13,000 to the Blue Cross.
She passed away in December 2007 and she left her estate to her husband, Peter. Following his death, her fortune was divided between a number of charities, including the Blue Cross.
Another celebrity who famously left money to the charity in his will was British fashion designer Alexander McQueen, who was a well-known lover of animals.
McQueen left £100,000 to the Blue Cross, as well as £50,000 for his own dogs in a trust fund to cover the cost of their upkeep for the remainder of their lives.
Speaking at the time, Blue Cross chief executive Kim Hamilton said: "It is a touching tribute to his obvious love for his dogs and his legacy will allow us to help many thousands more sick and homeless animals across the UK."