"Happy birthday to my little man!" she posted along with a photo of the proud mom kissing Camden's cheek. "He is the light of my life!"
"I was just surprised by myself about how natural it all came to me and how very at ease and calm I was with the whole thing," first-time mom Cavallari told Us Weekly in October 2012. "I'm still me — I still enjoy the same things and like the same things. I'm just an older, more mature version of myself."
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!