Kate Middleton and Princess Anne, Queen Elizabeth’s daughter, were seen together on Wednesday promoting maternity healthcare, People reported.
Their first joint expedition took them to the Royal College of Midwives and the Royal College of Obstetricians and Gynecologists in London.
Princess Anne and Kate both support charities.
Kate and Anne are said to be attending a panel discussion with healthcare experts and new mums about overcoming hurdles in maternity care.
Kate wore a flowing cream skirt and blazer with classic cream heels for the historic outing.
Princess Anne wore a teal dress with a teal scarf around her neck.