In these exclusive pics, Kelsey and Kayte are clearly overjoyed with the newest addition to their family.
"Our son will be called Gabriel as there is a tradition in our family of going by our middle names," Kelsey, whose full name is Allen Kelsey Grammer, tells ET. "We are blessed and excited to have this lovely young man join our family -- he is magnificent!"
The couple already has one child together, daughter Faith Evangeline Elisa, 2. The Frasier star also has four other children from previous relationships.