November 16, 2011 03:00 PM

It’s a boy for Niki Taylor and Burney Lamar! The model, 36, and her husband, former NASCAR driver Burney Lamar, welcomed son Rex Harrison on Wednesday, Nov. 16 at 11:03 a.m., they confirm to PEOPLE exclusively.

Weighing in at 7 lbs., 5 oz., and measuring 19 inches long, baby boy joins sister Ciel, 2½, and twin brothers Jake and Hunter, 16.

Taylor and Lamar, 31 — who wed in December 2006announced they were expecting in May. The model blogged her pregnancy for PEOPLE.com — check out her entries here.

Courtesy Lamar Family

— Sarah Michaud

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