Happy Birthday to Kristin Cavallari and Jay Cutler's little boy, Camden!

Kristin Cavallari Gives 'Intimate' Look Into Her Life As A Wife & Mother

On Saturday, the oldest child of the reality star and her husband turned three-years-old. Cavallari took to Instagram to post an adorable black and white snapshot of her child when he was a baby, writing a thoughtful message in the caption. She referred to her son as her "whole world."

See the picture below.

 It's hard to believe this little guy is 3 today. This picture feels like yesterday when he was just a few months old. Happy birthday my little man, Cam. You are my whole world

A photo posted by Kristin Cavallari (@kristincavallari) on Aug 8, 2015 at 8:18am PDT

Kristin Cavallari Bares Her Healthy Figure On Social Media

Later that day, Cavallari posted a photo of her son with his daddy as they were walking into a sports field. Camden held his father's hand as the two walked off in the distance in what appeared to be a wonderful day.

Cavallari and Cutler are also parents to their one-year-old son, Jaxon. The former Hills star is also pregnant with the couple's third child who is expected to be a girl. She will likely be brought into the world sometime this fall.

In a previous Instagram image, Cavallari showed off her pregnancy body where she looks healthy and glowing. As she dons a black dress with brown boots and a jean jacket, the 28-year-old holds her pregnant belly as she explores life in the city.

 City life today

A photo posted by Kristin Cavallari (@kristincavallari) on Aug 4, 2015 at 2:55pm PDT

Cavallari and Cutler have been married for two years now.

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Kristin Cavallari, Jay cutler