Jessica, who starred in the first and second series of the MTV reality series, welcomed her son earlier this month and has now shared some cute pictures of him online.
In one snap, the tot is wearing a cute black vest with a picture of a moustache and the words "little man" across the front.
Jessica has also posted a picture taken following Colton's birth. Alongside it, she simply wrote: "My boy." Aww, what a cutie!
Full-time mum Jessica - whose married surname is Smith-Evans - also has a daughter and another son with her husband Michael, who she married in 2009.
During her time on Laguna Beach, which was filmed while she was at high school, she was good friends with Kristin Cavallari.
However, during a recent interview with Kristin, she told Reveal that they had now drifted apart.
"I know Jessica has got kids now but we lost touch over the years, which is too bad," Kristin admitted to us.
Find out where the cast of Laguna Beach: The Real OC are now: