The singer just confirmed the happy news on Twitter: "I'm officially Mrs. Blackstock :) We got married yesterday at Blackberry Farms in TN, the most beautiful place ever!"
She also shared two gorgeous pictures from the big day:
The couple picked up their marriage license on Thursday, sparking rumors that the wedding would take place this weekend. After originally planning a 200-guest backyard celebration, they changed their minds back in August and decided to elope with just Blackstock's two children.
"It was exactly what they wanted," a source revealed. "It was beautiful."
Next on Clarkson's to-do list? "I already told him that when we're past the wedding, I want a baby," she told Access Hollywood.
Congratulations to the happy couple!More from Bridal Guide:
By Kristen O'Gorman Klein