Niki Taylor and Burney Lamar wed in December 2006.

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Niki Taylor and Burney Lamar welcomed son Rex Harrison on Wednesday

Their son weighed in at 7 lbs., 5 oz.

Rex Harrison joins sister Ciel, 2½, and twin brothers Jake and Hunter, 16

PEOPLE.com  — 

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, November 16 at 11:03 a.m.

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.

See the full article at PEOPLE.com.