The couple welcomed their third child on Monday, Nov. 23. The 28-year-old actress announced the news on her Instagram page.
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"Saylor James Cutler was born today at 132pm!!" Cavallari wrote in the photo post, which shows a pink onesie, bows and inked footprints.
Saylor joins big brothers Camden Jack, 3, and Jaxon Wyatt, 18 months.