The blond beauty, who married her high school sweetheart in January 2015, shared a photo of the two all dressed up and looking more in love than ever.
"Don't even know where to begin with this one, so I I'll start w/ IM SO HAPPY YOU WERE BORN 24 years ago today @carson.mcallister!!" she captioned it. "I really don't know how or what I did to deserve such a caring, kind-hearted, hilarious, loving husband but I'm so grateful every day that you're mine!"
"You are the light & love of my life!!" she continued, urging fans to show McAllister "some birthday love today."
Looks like Carson wasn't the only one from DWTS with a cause for celebration on Thursday, however. Julianne Hough, who judges the popular dance competition series, also took to Instagram to share a series of throwback pics from fiancé Brooks Laich's birthday bash last year. The NFL pro turned 34 on June 23.
Hough and Laich have a lot to look forward to as they're gearing up for their wedding on July 8 in Southern California. The two are tying the knot the same day as DWTS pros Peta Murgatroyd and Maksim Chmerkovskiy will be saying "I do" in Long Island, New York.
ET caught with Hough's brother, Derek, earlier this week at Travis Wall and Shaping Sound's new show, After the Curtain, in Los Angeles, where he gave us the scoop on how they expect the double wedding weekend to go down.