UPDATE: Baby A-llegan

Lady Antebellum had to cancel Sunday's show at the Allegan County Fair, the rest of the week will go on as scheduled.

Joe Nichols filled in on Sunday night when Lady Antebellum's Dave Haywood got the call that his wife Kelli had gone into labor early...

...another Baby A is on the way!

Performances for the rest of the week will go on as scheduled, with Florida Georgia Line on Wednesday and Hunter Hayes Friday night.

UPDATE:  Kelli was right, Lady Antebellum reported via Twitter:

So happy to have a healthy baby boy here with us! Cash Van Haywood was born last night,  Mom & Dad are doing great and couldn't be happier!