The 26-year-old "The Hills" star shared the news about her wedding to Jay Cutler via Twitter and Instagram on Friday.
"Im officially Kristin Elizabeth Cutler!!!!!" she wrote on Twitter linking to a picture of her sparkly wedding band.
Cavallari's announcement came days after it was reported that the couple traveled to Nashville, TN to purchase a marriage license.
The couple, who welcomed their first child, Camden, last month, has been planning for a summer wedding for a while. They got engaged in April 2011.