"Well... our boy Knox is here! About to have the best tasting cold beer of my life! So proud of my wife. She rocked it. Crazy stuff," he tweeted.
Bentley -- who has been touring in the Midwest -- also thanked hospital staffers who helped deliver his son. "Mad respect for doctors, nurses and everyone at hospitals. Can't believe y'all do that day in and day out. Hard work making miracles happen!"