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Charton, 34, debuted her baby bump on Instagram on Thursday for her birthday.
"34 🎂 🐣," she captioned the photo as she took a stroll with her daughter Kinsey Sioux, 1½.
Culkin, 38, and Charton welcomed their first child in September 2019.
Jazz Charton/instagram Jazz Charton and Daughter Kinsey Sioux
"After 25 hours of laboring at home, we arrived at the hospital too late for any pain meds as I was already dilated and ready to push (if I ever do this again I want ALL THE DRUGS, all of them!) and she was out within the hour during a full moon on Friday the 13th," Charton wrote on Instagram at the time, adding, "Of course our daughter was born on Friday the 13th."
In March, Charton reminisced about her daughter reaching the 18-month milestone.
Jazz Charton/Instagram Kieran Culkin, Jazz Charton, and daughter Kinsey Sioux
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"18 months with the greatest love I've ever known," she wrote. "And the greatest appreciation for how much I took sleep, napping, reading, watching a movie in one sitting, eating hot food, being bored, day drinking and not breastfeeding a blood thirsty toddler for granted."
Earlier this month, she also posted a photo of herself cradling Kinsey on a walk captioned, "Thanks for making me a mum, my little bean."