Son Kelsey Gabriel Elias Grammer was born in Los Angeles on July 22. Reported People magazine.
"We are blessed and excited to have this lovely young man join our family - he is magnificent. Our son will be called Gabriel as there is a tradition in our family of going by our middle names," he said in a statement.
The couple's new baby boy joins the actor's big brood, including their two-year-old daughter Faith Evangeline Elisa and Grammer's four children - Spencer, 30, Greer, 22, Mason, 12, and Jude, nine - from previous relationships.