08/11/2012 at 10:40 AM EDT
couldn't be happier with the new (little) man in her life.
"Being a mom is the most incredible feeling," she Tweeted
. "I am so in love with this little boy!"
The reality star, 25, and her Chicago Bears quarterback fiancé, 29, welcomed
7-lb., 9-oz. Camden Jack Cutler on Aug. 8.
Shortly after reconciling following a brief split
, the couple announced they were engaged
and, in January, confirmed they were expecting
their first child.– Mike Fleeman