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Kristin Cavallari posts adorable birthday tribute for 4-year-old son

/ Source: TODAY

Well, this is adorable.

"Laguna Beach" and "The Hills" alum Kristin Cavallari, 29, posted an adorable photo of her giving son Camden a smooch. "Happy 4th birthday to the sweetest soul I know, my little Cammers. I CANNOT believe it's been 4 years!"

Cavallari has three kids with Jay Cutler, the 33-year-old Chicago Bears quarterback: sons Camden and Jaxon, 2, and daughter Saylor, 8 months.

The former reality star might have chosen this photo for its professional, magazine-worthy look, but she isn't one to shy away from posting the grittier realities of motherhood. As her social media followers would note, she's taken pains to expose the other side of the "world's hardest job" as well.

RELATED: Kristin Cavallari and Jay Cutler celebrate 3rd anniversary — see the photo

"The glamorous side of the #BalancinginHeels #BookTour," she wrote in the caption of a recent Instagram picture that shows her in a stylish outfit, stilettos and all. The catch? She's also pumping. Somehow the device doesn't distract from her chic ensemble

Whether she's dressed up or down, we're happy to see this mom, author and businesswoman taking the time to show her kids some love.

And besides, this day's all about Camden. Happy birthday, little guy!