The 34-year-old blonde beauty, who got married to Pobre earlier this year, gave birth to the couple's first child Ava Grace Pobre on August 20.
"Jared and I have been blessed with the new love of our lives. We've never experienced a level of joy and happiness like this before! Thank you so much for all of the special wishes and positive energy," Kiebler wrote on her website.
Stacy, who split from Hollywood star George Clooney in July 2013, began dating Pobre, for whom she has known for more than five years, since last September. This was the first marriage for both of them.