"@ant_anstead and I are so excited to announce #babyanstead coming this September," Christina wrote on Instagram last month. "The kids are all so excited to meet their new sibling #5 #Gonnaneedabiggercar."
Ant is already a dad to daughter Amelie, 15, and son Archie, 12, from his previous relationship with ex-wife, Louise Anstead.
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Christina and Ant, who began dating in October 2017 after being introduced by a mutual friend, tied the knot in an intimate backyard ceremony in Newport Beach, CA, in December 2018.
The wedding took place less than a year after Christina's divorce from Tarek was finalized.
Christina found out she was pregnant with her third child right after enjoying her honeymoon with Ant.
She later vented on social media about how her first trimester of this pregnancy was "brutal."
"It really [blindsided] me. Nausea, exhaustion, too many food aversions, too many carbs," she shared on Instagram.
"Thank you to my amazing husband for being so supportive while his new bride was complaining and a little more cray than usual."
Last summer, HGTV announced Christina had signed a deal for a new original series called Christina on the Coast.
Christina on the Coast will feature the real estate and house-flipping expert expanding her design business in Southern California and transforming clients' outdated properties into high-end showplaces.