Writing in her weekly Access Hollywood blog, Cavallari said: "I'm so sad it's already over but extremely grateful for this incredible experience! I've had the time of my life and wouldn't trade it for the world."
She went on to thank everybody who voted for her and professional partner Mark Ballas, and wished the remaining contestants luck throughout the remainder of the show.
Cavallari added: "Even though this is my last DWTS blog, I've only just begun! So much to look forward to and I'm excited to bring you guys along with me on my next journey!"
The reality star had scored 24 out of a possible 30 points for her final routine, a samba inspired by the most memorable year of her life.