Courtesy of Niki Taylor
Caitlin Petreycik
Nov 18, 2011 @ 3:00 pm

Supermodel and Celebrity Apprentice alum Niki Taylor and her husband, former NASCAR driver Burney Lamar welcomed their fourth child this week—son Rex Harrison! "Thank you so much for all the congrats baby Rex has arrived and Burney and I are so blessed. Thank you again," Taylor tweeted. Congratulations to the proud parents!

Plus, click through to see more of Hollywood's hottest new moms.

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