In a statement given to Refinery29, Middleton's rep confirms the couple welcomed their son Monday October 15 at 1:58 p.m., local time. He weighed 8 pounds and 9 ounces. "Everyone is delighted and Mother and baby are doing well," they shared.
Kate and her husband Prince William shared a statement through the Kensington Palace. The couple is "thrilled" for the new member of their growing extended family.
Their son, whose name has not yet been revealed, will be the cousin of the Duchess of Cambridge's children, Prince George, Princess Charlotte, and Prince Louis.
This story has been updated with additional reporting.