"John, Kelly and their daughter Ella Bleu are ecstatic and very happy about the newest member of the family," a rep for the family said. "Both mother and baby are healthy and doing beautifully."
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The family announced Preston's pregnancy last May, 17 months after their 16-year-old son Jett died after suffering a seizure during a family vacation.
Benjamin was born weighing 8 pounds, 3 ounces.