In the sweet pic, Clarkson held 2-year-old daughter River while her husband, Brandon Blackstock, is carrying their 8-month-old son, Remington. Savannah and Seth, Blackstock's two older children from a previous relationship, rounded out the photo on either side of the frame, while Santa sat smack in the middle of the blended family.
"Merry Christmas from the Blackstock's ??? #Santa #Iknowhim," Clarkson captioned the card.
Can you get over how cute River's reindeer antlers and Seth's Santa hat are? Neither can we!
Clarkson, 34, has done quite a bit of celebrating already this year. The American Idol winner was the Grand Marshal at the Piedmont Natural Gas Nashville Christmas Parade earlier this month. It was the first parade River ever experienced, and she pretty much stole the show from her mama!
Earlier this month, Clarkson opened up to ET about her feelings on Remy's first Christmas. "It is such second child syndrome, y'all," she joked. "But I learned from River last Christmas, she doesn't know what is going on."
That doesn't mean the Texas native isn't excited to celebrate with her little ones! Find out more about her holiday plans in the video below.