Kristin Cavallari shared a photo taken during a party celebrating her son Camden's first birthday on Thursday.
The baby boy arrived one year ago on Aug. 8 and was welcomed by Cavallari and her now-husband Jay Cutler.
"Happy birthday to my little man," the 27-year-old mom posted to Twitter. "He is the light of my life."
10 months after Camden was born, Cavallari married Chicago Bears quarterback Cutler in Nashville, Tenn., where their son was a member of the wedding party.
"We had two flowers girls so one of them pulled [Camden] and our nephew in a wagon, and the other flower girl was throwing rose petals behind," Cavallari told People.
As for the rest of the wedding and reception, the former "Laguna Beach" star said everything was "absolutely perfect."
"The flowers and everything were very simple but it was very warm and cozy," the bride told People magazine. "It was all about the lighting and the candles and the atmosphere was just so warm."
Following the wedding, Cavallari, Cutler and their son settled into life in Chicago. When she is not busy with her son, the reality television star finds time for design projects such as her shoe line with Chinese Laundry as well as a jewelry collection.
However, no matter how busy Cavalllari is, she said family would always remain her number one priority.
"I've passed on a couple of things that would have kept me here in L.A. because Jay has to be in Chicago, so if I was here, we would never see each other," she explained to Coco Eco magazine earlier this year. "The sacrifices we make for love."
In addition to relocating from her hometown of Los Angeles to Chicago, the reality television star also noted her acting career has been put on hold.
"It's easy to get wrapped up in your career and have that be your only focus, and I want my marriage to work and last, and family comes first," Cavallari told Coco Eco. "The design work is great because I can do most of it from Chicago and I have so much fun with it. I love it and it all works out."