"Momma bear @katiemheigl hangin outside with Adalaide during another beautiful afternoon up here in the mountains," the 33-year-old singer wrote in a caption to accompany the snap.
Dressed in cowboy boots, denim cut-off shorts, a loose shirt and cowboy hat, smiling Katherine can be seen holding the hand of her adorable 16-month-old daughter, who is wearing a little sundress and sucking her thumb.
Katherine, 34, and Josh, who were married in December 2007, adopted Adalaide from Louisiana in April 2012.
"Her full name is Adalaide Marie Hope Kelley," Katherine later explained. "Adalaide because of my great-grandmother, Marie after my middle name, and Hope because that is what the process became."
The happy couple are also parents to three-year-old Naleigh, who they adopted from South Korea in April 2009.
"She is loving being a big sister," a source told US Weekly of Naleigh in May 2012. "Everyone is doing great. They're thrilled to add to the family!"