The photo, posted on Friday morning, shows Matthew holding their twin daughters, Chandler and Sawyer, who were born on March 31, 2017.
Hunter Hope Stafford was born last Thursday, Aug. 16.
In the post, Kelly writes, "On August 16, Matthew and I welcomed another baby girl into our crazy family! Hunter Hope Stafford is healthy and adjusting to the role of being a baby sister :) Thank you for giving us some time to get acclimated to becoming a family of 5.. and now here she is! We are smitten by her! Welcome to the #StaffordSisterSquad."