Sean, 34, announced the birth of the couple's baby boy via Twitter on Friday.
"We're having a baby today!" Sean wrote. "When the nurse at the front desk asked for our insurance card, I told her I also had a half off coupon and now I get to sit in the waiting room during the birth!"
The couple revealed Catherine was pregnant with Baby No. 2 in November 2017. They decided to remain in the dark, however, about the baby's gender until his or her birth so they could be surprised.
"We are so thrilled to announce that we are expecting our second child! We consider ourselves so blessed to have Samuel in our lives and we are already thanking God for the newest edition to our family who should be arriving in late May," the pair told Us Weekly at the time.
"We are so thankful to everyone who has followed our little family and encouraged us along the way!"
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After Sean completed a stint on Dancing with the Stars' sixteenth season, he and Catherine tied the knot in January 2014 for a live ABC television special.
They both subsequently appeared on Celebrity Wife Swap and Marriage Boot Camp before Samuel was born in Summer 2016.