The baby boy will be the first child for the couple, who tied the knot in December 2013. Holker has a 7-year-old daughter named Weslie from a previous relationship.
In October, Ellen DeGeneres jokingly revealed the “first ultrasound” of the baby, showing Boss -- who frequently appears on her daytime talk show as a guest DJ -- a clip of his face Photoshopped onto a dancing baby.
"It's got your eyes and your hat," Ellen teased. "You got nervous for a minute, like I had your ultrasound."